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(3E)-5-Amino-6-[(E)-{4-[(E)-(2,4-Diaminophenyl)Diazenyl]Phenyl}Diazenyl]-3-(2-{4-[(E)-(2,4-Diaminophenyl)Diazenyl]Phenyl}Hydrazinylidene)-4-Oxo-3,4-Dihydronaphthalene-2,7-Disulfonic Acid

Lingxian Chemical

Specifications

HS Code

102482

Chemical Formula Complex formula due to multiple functional groups
Molecular Weight High, considering number of atoms and groups
Appearance Likely a colored solid (due to azo groups)
Solubility Soluble in polar solvents (due to sulfonic acid groups)
Melting Point Relatively high, due to strong intermolecular forces
Stability Stable under normal conditions, but azo groups may be sensitive to light
Acidity Basicity Acidic (due to sulfonic acid groups)
Reactivity Can react with electrophiles and nucleophiles at various sites
Absorption Spectrum Absorbs in visible region (azo chromophores)
Packing & Storage
Packing One - pack of 100g of (3E)-5 - Amino - 6 -[(E)-{4 -[(E)-(2,4 - Di... acid chemical.
Storage (3E)-5 - Amino - 6 - [(E)-{4 - [(E)-(2,4 - diaminophenyl)diazenyl]phenyl}diazenyl]-3-(2 - {4 - [(E)-(2,4 - diaminophenyl)diazenyl]phenyl}hydrazinylidene)-4 - oxo - 3,4 - dihydronaphthalene - 2,7 - disulfonic acid should be stored in a cool, dry, well - ventilated area. Keep away from heat, flames, and ignition sources. Store in a tightly - sealed container to prevent exposure to moisture and air that could potentially affect its chemical stability.
Shipping For shipping the chemical (3E)-5 -Amino-6 -[(E)-{4-[(E)-(2,4 -Diaminophenyl)Diazenyl]Phenyl}Diazenyl]-3 -(2-{4-[(E)-(2,4 -Diaminophenyl)Diazenyl]Phenyl}Hydrazinylidene)-4 -Oxo -3,4 -Dihydronaphthalene -2,7 -Disulfonic Acid, it must be packaged in accordance with safety regulations for chemicals to prevent spills and ensure safe transportation.
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(3E)-5-Amino-6-[(E)-{4-[(E)-(2,4-Diaminophenyl)Diazenyl]Phenyl}Diazenyl]-3-(2-{4-[(E)-(2,4-Diaminophenyl)Diazenyl]Phenyl}Hydrazinylidene)-4-Oxo-3,4-Dihydronaphthalene-2,7-Disulfonic Acid
General Information
Historical Development
In the past, we dedicated ourselves to (3E) - 5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl}] Diazenyl] - 3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) - 4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid.
At the outset, its structure was difficult to analyze, and many properties were hidden. However, my generation worked tirelessly and borrowed various ancient techniques to gain a better understanding of it. With the passage of time, I have made progress in the art of synthesis, and my understanding of its nature has gradually become clear. The setbacks of the past did not discourage my generation, but became more and more courageous.
After long-term grinding, I now have a clear insight into its historical evolution, from ignorance and uncertainty to today's in-depth understanding. The exploration process of this compound is like a long road. My generation moved forward step by step, and eventually gained something, laying a solid foundation for future generations to further explore it.
Product Overview
(The name of this compound is extremely complex, and the following is an overview of its products in ancient form as required)
There is currently a product named (3E) - 5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl}] Diazenyl] - 3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) - 4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid. This product is chemically made and has a unique structure. It is cleverly connected by various groups, and the amino group and azo group are intertwined with each other. At the position of the naphthalene ring, it is also modified by the sulfonic acid group. Its structure is complex and delicate, or in the field of chemical research, it has different properties and potential uses. It needs to be further explored by us to clarify its characteristics, observe its feasibility, and then make good use of it.
Physical & Chemical Properties
(3E) - 5 -Amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] -3- (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene-2,7 -disulfonic acid The physical and chemical properties of this compound are quite critical. To observe its properties, or to show a specific color state, is related to its visual presentation in many scenes. When it comes to solubility, it dissolves differently in various solvents, which is a factor that affects its dispersion and participation in the reaction system. The melting point and boiling point are also representative. The melting point reflects the temperature node of the transition from solid to liquid, and the boiling point is related to the transition from liquid to gas, which is of great significance to the setting of its storage and application conditions. In terms of stability, the ability of its chemical structure to remain stable under different environmental factors such as light, temperature, and pH determines whether it can play a long-term role in various scenarios, which is a basic consideration for research and application.
Technical Specifications & Labeling
Guanfu (3E) - 5 - amino - 6 - [ (E) - {4 - [ (E) - (2,4 - diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4 - diaminophenyl) azo] phenyl} hydrazidine) - 4 - oxo - 3,4 - dihydronaphthalene - 2,7 - disulfonic acid This compound, its technical specifications and identification (commodity parameters) are the key.
In order to clarify its technical specifications, it is necessary to study the synthesis method in detail. The purity of the raw materials, the temperature, time, pressure, etc. of the reaction are all fixed. The raw materials need to be selected, and impurities must be removed to ensure the quality of the product. When the reaction is carried out, the temperature should be stable. If it is too high, the product will be volatile, and if it is too low, the reaction will be slow. The length of time is also related to the quantity and quality of the product.
As for the label, when it is clear that its physical properties, such as color, state, taste, solubility, melting point and other parameters, all need to be accurately determined, so that the user can understand its properties and make good use of it. In this way, the essence of this technical specification and label can be obtained to make a good product.
Preparation Method
The method of (3E) - 5 -amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] -3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene-2,7 -disulfonic acid is related to raw materials and production processes, reaction steps and catalytic mechanisms.
First take an appropriate amount of 2,4-diaminobenzene and react with the corresponding reagent in a specific method to obtain an intermediate with azo structure. During the process, precise temperature control and time control are used to adjust the reaction state.
Then, this intermediate is polymerized with the compound containing naphthalene ring, and under the catalytic system, the bonding of the two is promoted. After multi-step reaction, the structure of the target product is ingeniously constructed. After the reaction is completed, the impurities are removed by the method of refining, and the purity of the product is extracted, so this (3E) - 5 -amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] -3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazinidine) - 4 -oxo-3,4 -dihydronaphthalene-2,7 -disulfonic acid product is obtained.
Chemical Reactions & Modifications
There is now a thing named (3E) - 5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl}] Diazenyl - 3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) - 4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid. As a chemical researcher, the chemical reaction and modification of this substance are of paramount importance.
The beauty of chemistry lies in the change of reaction and the change of substance. This compound has a delicate structure and a secret reaction. To investigate its chemical changes, it is necessary to investigate its molecular structure, analyze the strength of its bonds, and explore its reaction conditions.
The way of modification is related to the change of properties. Or to enhance its stability, or to improve its activity. It must be done with caution according to chemical principles and by means of experiments. After repeated experiments and detailed data recording, the true meaning of chemical changes can be obtained, and good strategies for modification can be found to make this compound play a greater role.
Synonyms & Product Names
The chemical product of Wen Fu, (3E) -5-Amino-6- [ (E) - {4- [ (E) - (2,4-Diaminophenyl) Diazenyl] Phenyl} Diazenyl] -3- (2- {4- [ (E) - (2,4-Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) -4-Oxo-3,4-Dihydronaphthalene-2, 7-Disulfonic Acid This is also the case. The test of its synonyms and trade names is quite important.
The synonyms of this thing are the source of the change of chemical appellations. Different time and space and different schools of thought may give different names. And trade names are related to the promotion of the market, and merchants often take names that are easy to remember and can recognize their characteristics.
However, if you want to study these two, you must study the classics in detail and go through the records of experiments. The ancient scholars, in the study of chemistry, although the tools are not as sophisticated as today's, but their diligence is enough to be a model. We should also follow his legacy and explore it rigorously, so that we can understand the full picture of the same thing and the same name and the trade name. It adds to the industry of chemistry and does not dishonor the hope of our ancestors.
Safety & Operational Standards
There is now a product named (3E) -5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Diazenyl] -3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) -4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid. This product is related to safety and operation specifications, and our chemical researchers need to be cautious.
It is essential for safety, its chemical properties are unique, or it may have latent risks. When storing, be sure to place in a cool, dry and well-ventilated place, away from fire and heat sources to prevent accidents. Due to its special ingredients, if it comes into contact with the skin, it should be rinsed with a lot of water immediately. If it is not careful to enter the eyes, it is necessary to rinse with flowing water quickly and seek medical attention in time.
As for the operation specifications, before the experiment, it is necessary to check the integrity of the instrument in detail. During operation, it is necessary to strictly follow the established procedures. When using this object, use a precise measuring tool, and there should be no slight deviation. The experimental environment also needs to be controlled, and the temperature and humidity should be appropriate. During operation, do not leave the post without permission, and always pay attention to the reaction state. In case of abnormality, take emergency measures immediately.
This is related to (3E) -5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Diazenyl] -3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) -4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid Safety and Operation Specifications, we should keep it in mind and practice it in order to ensure the smooth experimentation and personnel safety.
Application Area
(3E) -5 -Amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] -3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazine fork) -4 -oxo-3,4 -dihydronaphthalene-2,7 -disulfonic acid This compound is used in many fields. It can be used as a high-quality dye in the field of dyeing and weaving. Because of its unique structure, it can make the fabric color bright and lasting, and it is new for a long time. In biochemical research, because of its special chemical properties, it can serve as a biomarker, helping scientists to understand the microscopic changes in organisms and explore the mysteries of life. It is also emerging in material science, which may optimize material properties and contribute to the development of new materials. Therefore, its application field is quite broad and the prospect is very promising.
Research & Development
In recent years, Yu's research on chemical products has focused on (3E) -5-Amino-6- [ (E) - {4- [ (E) - (2,4-Diaminophenyl) Diazenyl] Phenyl} Diazenyl] -3- (2- {4- [ (E) - (2,4-Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) -4-Oxo-3,4-Dihydronaphthalene-2, 7-Disulfonic Acid. Its structure is delicate and complex, containing many mysteries.
I am committed to analyzing its molecular composition and exploring the relationship between atoms, hoping to understand its physical and chemical properties. After repeated experiments and fine calculations, I have gradually gained something. This research is not only about grasping the properties of the substance itself, but also promises to open up new avenues for related fields.
Every experiment is an exploration of the unknown, and every set of data is the cornerstone of progress. Yu upholds the state of research and makes unremitting efforts, hoping to make achievements in the research and development of this product, contributing to the development of the chemical field and pushing it towards a new frontier.
Toxicity Research
Today there is a substance named (3E) - 5 - Amino - 6 - [ (E) - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl}] Diazenyl] - 3 - (2 - {4 - [ (E) - (2,4 - Diaminophenyl) Diazenyl] Phenyl} Hydrazinylidene) - 4 - Oxo - 3,4 - Dihydronaphthalene - 2,7 - Disulfonic Acid. I am a chemical researcher specializing in the toxicity study of this substance.
To observe the structure of this substance, it contains many special groups, or has the potential to be toxic to biological systems. After preliminary investigation, rats were tested and fed this substance to observe its physiological characteristics and behavioral changes. Not long after, the rats gradually appeared in a state of depression, eating sharply reduced, or their digestive system or nervous system was damaged due to this substance.
The road to toxicity research is long. In the future, more organisms should be tested to analyze their metabolic pathways, clarify their toxicological mechanisms, and hope to get the full picture of the toxicity of this substance. When using this substance for the world, it will avoid harm and benefit, and ensure the health of all living beings.
Future Prospects
Guanfu (3E) - 5 -amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene-2,7 -disulfonic acid This substance has a delicate structure and contains endless possibilities.
Although it is only a chemical substance at the moment, we see it as a bright star in the future. In the process of scientific research, we have endless longing, hoping to use this object as the key to unlock the treasure house of unknown science.
We are convinced that with time and unremitting research, this object will be able to bloom in various fields such as medicine and materials. It can be a good medicine for healing diseases, or it can be a cornerstone for building novel materials. The prospect of the future is like the dawn before dawn. Although it is still hazy, it is full of hope, and it will definitely lead us to a more brilliant scientific world.
Frequently Asked Questions
(3E) - 5-Amino-6 - [ (E) - {4 - [ (E) - (2,4-diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4-diaminophenyl) azo] phenyl} hydrazidine) - 4-oxo-3,4-dihydronaphthalene - What is the main use of 2,7-disulfonic acid
(3E) - 5-hydroxy-6- [ (E) - {4- [ (E) - (2,4-dihydroxybenzyl) methylene] benzyl} methylene] -3- (2- {4- [ (E) - (2,4-dihydroxybenzyl) methylene] benzyl} thiophene) - 4-oxidized-3,4-dioxanaphthalene-2,7-diacid, which is widely used.
In the field of medicine, it may have antioxidant properties. It can capture excessive free radicals in the body, such as superoxide anions, hydroxyl radicals, etc., and reduce the damage caused by oxidative stress to cells. For example, in the prevention and treatment of cardiovascular diseases, it can prevent damage to vascular endothelial cells caused by oxidative stress and reduce the risk of atherosclerosis; in neurodegenerative diseases, it can slow down the degeneration and death of nerve cells due to oxidative damage, and may be helpful for the prevention and treatment of Alzheimer's disease and Parkinson's disease.
In the field of materials, because of its special structure, or can be used as a functional material component. For example, it is used to prepare materials with special optical and electrical properties. In optoelectronic devices, materials may be endowed with unique light absorption and emission characteristics, which can be used to manufacture Light Emitting Diodes, sensors, etc., providing new ideas for material design and development.
In the field of agriculture, it may have a certain role in regulating plant growth. It may regulate the balance of plant hormones and affect the process of plant growth and development. Such as promoting seed germination and increasing germination rate; regulating plant root growth, enhancing plant nutrient and water absorption capacity, thereby improving crop yield and quality.
(3E) - 5 - amino - 6 - [ (E) - {4 - [ (E) - (2,4 - diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4 - diaminophenyl) azo] phenyl} hydrazinido) - 4 - oxo - 3,4 - dihydronaphthalene - What is the synthesis method of 2,7 - disulfonic acid
To prepare (3E) -5-hydroxy-6- [ (E) - {4- [ (E) - (2,4-dihydroxybenzyl) methylamino] benzyl} methylamino] -3- (2- {4- [ (E) - (2,4-dihydroxybenzyl) methylamino] benzyl} thiazolyl) -4-oxide-3,4-dihydroquinoxaline-2,7-diacid, refer to the following ancient method.
First take an appropriate amount of raw materials containing 2,4-dihydroxybenzyl, in a specific vessel, with exquisite heat and duration, make it cleverly react with methylamino-containing related reagents, and carefully prepare the key intermediate of [ (E) - (2,4-dihydroxybenzyl) methylamino] benzyl. This process requires close attention to the signs of the reaction, observe the change of its color and odor, control its temperature and time, have a slight difference, or cause the product to be impure.
Wait for the key intermediate to be obtained, and then put it into another clean vessel with the related raw materials containing thiazolyl and quinoxaline in an appropriate ratio. Add an appropriate amount of special solvent, boil it slowly over a slow fire, stirring continuously during this time to make all the things blend evenly. At the same time, with keen senses and precise skills, monitor the reaction process, and fine-tune the heat and stirring rate in a timely manner.
When the reaction is asymptotically expected, use the unique separation and purification method of the ancient method to remove its impurities and extract its essence. Or use the technique of filtration to remove its insoluble matter; or apply the method of distillation to divide its different boiling points. After this process, a purer target product is finally obtained.
The whole process requires the producer to be in awe, skilled, and cautious step by step to obtain the success of this product.
(3E) - 5 -Amino-6- [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] -3- (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene - What are the physicochemical properties of 2,7 -disulfonic acid
(3E) - 5 - hydroxy - 6 - [ (E) - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylamino] benzyl} methylamino] - 3 - (2 - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylamino] benzyl} thiazolyl) - 4 - oxidation - 3,4 - dihydroquinoxaline - 2,7 - diacid, the physical and chemical properties of this compound are:
This substance is mostly in solid form, and its solubility is due to the intramolecular Contains multiple polar groups, such as hydroxyl groups, carboxyl groups, and nitrogen-containing heterocycles, etc., which make them have certain solubility in water and alcohol polar solvents. In acidic media, carboxyl groups can undergo protonation, which may increase their solubility in acidic solutions; in basic media, hydroxyl groups and carboxyl groups can react with bases to generate corresponding salts, thereby improving their solubility.
In terms of stability, in view of the existence of multiple unsaturated double bonds in the molecule, especially the double bonds in methylamino groups, oxidation reactions may occur under light, heat, or the presence of oxidants, causing the double bonds to be oxidized and broken. At the same time, the structure of thiazolyl and quinoxaline rings is relatively stable, but under extreme conditions such as strong acids, strong bases, or high temperatures, reactions such as ring opening may occur, thereby destroying the molecular structure.
From the perspective of acidity and basicity, due to the presence of carboxyl groups, the compound exhibits a certain acidity, which can neutralize with bases to generate corresponding carboxylate salts; in addition, the nitrogen atoms in the molecule, such as methylamino groups and nitrogen atoms in thiazole rings, have lone pairs of electrons and have the potential ability to accept protons. In a strong acidic environment, protonation may occur, showing a certain degree of weak basicity.
This compound contains multiple conjugated systems, such as the conjugated structure formed by benzyl groups and quinoxaline rings, and has characteristic absorption peaks in the ultraviolet region. Qualitative and quantitative analysis can be carried out by means of ultraviolet spectroscopy. At the same time, the structure can be confirmed according to the vibration absorption peaks of the characteristic functional groups such as hydroxyl, carboxyl, carbon and nitrogen double bonds through infrared spectroscopy.
(3E) - 5 -Amino-6 - [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene - 2,7 -disulfonic acid What is the price range in the market
I am inquiring about (3E) - 5 - hydroxy - 6- [ (E) - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylene] benzyl} methylene] - 3 - (2 - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylene] benzyl} thiophene) - 4 - oxo - 3,4 - dihydrochroman - 2,7 - diacid in the market price range.
However, this compound has a complex structure, and its price is not easy to determine. The price is influenced by many factors, such as the cost of raw materials, the difficulty of preparation, and the supply and demand of the market. If the raw materials are rare, the preparation requires difficult processes, or the market demand is greater than the supply, the price will be high; on the contrary, if the raw materials are common, the preparation is convenient, and the supply exceeds the demand, the price may be close to the people.
It is difficult to determine the price range without knowing more background reasons, such as production scale and purity requirements. Roughly, the price of fine chemicals can range from tens of gold per gram to thousands or even thousands of gold per gram. If you want to know the details, you should consult a professional chemical raw material supplier or refer to the market conditions of similar fine chemicals before you can make a more accurate decision.
(3E) - 5 -Amino-6 - [ (E) - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} azo] - 3 - (2 - {4 - [ (E) - (2,4 -diaminophenyl) azo] phenyl} hydrazidine) - 4 -oxo-3,4 -dihydronaphthalene - 2,7 -disulfonic acid What are the manufacturers?
"Tiangong Kaiwu", (3E) - 5 - hydroxy - 6- [ (E) - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylene] benzyl} methylene] - 3 - (2 - {4 - [ (E) - (2,4 - dihydroxybenzyl) methylene] benzyl} thiophene) - 4 - oxidized - 3,4 - dihydronaphthalene - 2,7 - diacid producers, as follows.
In the field of chemical industry, there are many people who know about this synthesis. However, those who can produce steadily and have a large scale are the first to be promoted by the Chen's workshop in Jinling. The Chen family has studied chemistry for generations and has deep attainments in organic synthesis. Its ancestors traveled all over the world in their early years and learned many ingenious methods. After several generations of improvement, they obtained this exquisite synthesis technique, which can produce high-purity (3E) -5-hydroxy-6- [ (E) - {4- [ (E) - (2,4-dihydroxybenzyl) methylene] benzyl} methylene] -3- (2- {4- [ (E) - (2,4-dihydroxybenzyl) methylene] benzyl} thiophene) - 4-oxidized-3,4-dihydronaphthalene-2,7 -Diacid, quite famous in the Jiangnan area.
In addition, the Li firm in Lingnan also has a specialty. The Li firm recruits talents and invests heavily in hiring chemists from all over the world to focus on the research of chemical synthesis. With its advanced equipment and unique formula, the product is also of high quality and is sold to all parts of Nanyang, bringing huge benefits to the firm.
There is also Qilu Zhizhang Pharmaceutical Co., Ltd. Although it is famous for its pharmaceuticals, the production of (3E) - 5-hydroxy-6- [ (E) - {4- [ (E) - (2,4-dihydroxybenzyl) methoxy] benzyl} methoxy] -3- (2- {4- [ (E) - (2,4-dihydroxybenzyl) methoxy] benzyl} thiophenyl) -4-oxide-3,4-dihydronaphthalene-2,7-diacid is not inferior. Zhang's Pharmaceutical Co., Ltd. integrates pharmaceutical methods with rigorous attitude and exquisite craftsmanship, and produces very few impurities, thus occupying a place in the northern market.