Alas! To understand the chemical structure of this substance, we should study the relationship between its components in detail. The so-called valine is one of the essential amino acids of the human body, and its chemical structure has its own unique features. The molecular formula of valine is $C_5H_ {11} NO_2 $. Looking at its structure, it has one amino group ($- NH_2 $) and one carboxyl group ($-COOH $), which are the characteristic groups of amino acids. And its side chain is isopropyl ($-CH (CH_3) _2 $), which gives valine specific physical and chemical properties.
As for "4-hydroxyl - β - -ethyl butyrate", it also has its unique structure. This compound contains a monoester group ($-COO- $), which is formed by esterification of ethanol and β-oxo-4-hydroxybutyric acid. In its molecule, the 4-position carbon atom is connected with a hydroxyl group ($-OH $), and the β-position carbon atom is connected with a carbonyl group ($C = O $). The presence of this carbonyl group and hydroxyl group greatly affects its chemical activity and reaction characteristics.
Valine and 4-hydroxyl - β - oxo-butyrate ethyl ester, although they are different compounds, are all important in the field of organic chemistry. Valine is indispensable in protein synthesis in vivo, while 4-hydroxy- - β - -ethyl butyrate is often an important intermediate in organic synthesis, participating in many chemical reactions, and can prepare various organic compounds with specific functions. The chemical structures of the two are exquisite, laying the foundation for chemical research and practical application.

Xinyi has a wide range of uses. Xinyi has a warm and refreshing taste, enters the lungs and stomach meridians, and has the ability to dissipate wind and cold and pass through the nostrils.
Cover the wind and cold on the surface, and the lung qi is lost. If you see headache, nasal congestion, and runny nose, Xinyi can help dissipate wind and cold, so that the lung qi is smooth, and the nostrils are self-connected. "Compendium of Materia Medica" says: "Xinyi is warm and gentle, and it can help clear the sun in the stomach and ascend, so it can warm the middle and cure the diseases of the head, face, and nose." This sincere statement has its effect.
The disease of the abyss of the nose of the man is not only turbid, but the nasal congestion does not smell the smell. Xinyi is an important medicine for treating the abyss of the nose. It is often accompanied by Angelica dahurica, Xanzi, mint, etc., to clear heat and dissipate wind, and aromatic and penetrate the orifices. For example, the Xanzi powder in Jisheng Prescription is used to treat the abyss of the nose with Xinyi with Xanzi, Angelica dahurica, and mint, and the curative effect is quite good.
And in the case of cold on the face, Xinyi also has the effect of dissipating cold and relieving pain. Because of the power of Xinyi to warm the face, it can disperse the evil of cold on the face and relieve its pain.
And Xinyi is also effective for external use. It can be smoked and washed in the nose, so that the medicinal power can reach the infirmary and relieve the
However, the way of medication should be applied after verification. Xinyi is warm in nature, if it is a wind-hot nasal abyss, or a person with yin deficiency and fire, it should be used with caution, so as not to help heat and make fire and aggravate the condition.

The synthesis of saltpeter, tetrahydroxy- - β - oxo-, ethyl ester is an important matter in organic synthesis. To make this product, you can follow the following methods.
First, use the corresponding alcohol and acid anhydride as raw materials to form an acylation reaction. First take an appropriate amount of alcohol, place it in a clean reactor, slowly add acid anhydride, and add an appropriate amount of catalyst, such as sulfuric acid or p-toluenesulfonic acid. The temperature is controlled in a suitable range, usually about 60 to 80 degrees Celsius. During the reaction, it is necessary to continuously stir during the reaction to make the reactants fully contact and accelerate the reaction process. After the reaction is completed, neutralize the excess acid in the alkali solution, and then purify the product by extraction, distillation, etc., to obtain saltpeter, tetrahydroxy- - β - oxo-, ethyl ester.
Second, halogenated hydrocarbons and carboxylic salts can also be used as raw materials, obtained by nucleophilic substitution reaction. Take halogenated hydrocarbons and carboxylic salts, and dissolve them in a suitable solvent in an appropriate ratio, such as acetone or ethanol-water mixed solvent. Add an appropriate amount of base, such as potassium carbonate or sodium carbonate, to promote the reaction. When the reaction is heated for a number of refluxes, the generated salt is filtered off after the reaction is completed, and the filtrate is purified by vacuum distillation. The product can also be obtained.
Or, using aldodes or ketones as the starting materials, it is prepared through a series of reactions. First, the aldodes or ketones and alcohols undergo a condensation reaction to generate acetals or ketals, and then the structure of the target molecule is gradually constructed through oxidation, esterification and other steps. Although this approach is slightly complicated, the reaction route can be flexibly adjusted according to different raw materials and conditions to achieve the purpose of synthesis.
When synthesizing, it is necessary to pay attention to the precise control of the reaction conditions, and the purity of the raw materials is also crucial, which is related to the yield and purity of the product. After each reaction step, it is necessary to use suitable analytical methods, such as thin layer chromatography, nuclear magnetic resonance, etc., to monitor the reaction process and the purity of the product, so as to adjust the reaction strategy in time, and finally obtain pure saltpeter, tetra- hydroxyl - β - oxo -, ethyl ester.

Its shape is mostly white crystals, often in the state of particles or powder, and the appearance is delicate, like the slightest frost and snow, its color is pure, no variegated dye. When touched, it feels dry, not sticky or greasy, and flows freely between the palms of the fingers.
Smell it, saltpeter breath is very small, no pungent smell, but if it is a fine product, there is also a faint sense of clarity, which is difficult for non-sensitive people to detect.
As for its solubility, saltpeter is very easy to dissolve in water. In contact with water, it is like ice and snow into soup, quickly disappearing and turning into a clear liquid. And when it dissolves, the water temperature decreases slightly, which is its unique property.
When it comes to the melting point, saltpeter has a high melting point, and it needs a strong fire to melt it. If it is roasted in an ordinary fire, its shape is not easy to change. As for the boiling point, it is even higher, and it can be boiled and vaporized by unusual means.
Furthermore, the density of saltpeter is moderate, neither as light as flocculent nor as heavy as lead. It has an appropriate texture when placed in the hand. Its texture is relatively hard, although not indestructible, nor can it be easily crushed, and its broken state can be seen by hitting it with a hard object.
The electrical properties of saltpeter, which is an insulator under normal circumstances, are non-conductive, making it a different way for electrical use.
The physical properties of saltpeter (4-hydroxyl - β - , ethyl ester) are clear, and it is beneficial for all kinds of uses.

What I am asking you is the market prospect of succinic acid, 4-hydroxy - β - oxo-, ethyl ester. This substance has a wide range of uses in this world, and the future may be bright.
Succinic acid, 4-hydroxy - β - oxo-, ethyl ester, is an important material for organic synthesis. In the field of medicine, it is often the raw material for the creation of new drugs. At present, the pharmaceutical industry is booming, new diseases are waiting to be treated, and the demand for new drugs is increasing day by day. When synthesizing drug molecules with specific structures, it can provide an effective way for drug developers with its unique chemical properties. Therefore, with the expansion of pharmaceutical research and development, the need for this substance may also rise.
In the chemical industry, this ethyl ester can be the cornerstone of the synthesis of fine chemicals. Chemical products are widely involved in life, from daily necessities to industrial materials, are indispensable. With the advancement of chemical technology, the demand for high-quality, high-performance fine chemicals is increasing. Succinic acid, 4-hydroxy - β - oxo -, ethyl ester can be used to prepare polymer materials and surfactants with special properties because of its specific reactivity and structural characteristics. Therefore, the development of the chemical industry will also promote the rise in market demand for this substance.
Furthermore, with the rise of environmental protection, many chemical and pharmaceutical processes are seeking green and sustainable methods. Succinic acid, 4-hydroxy - β - , ethyl ester in some synthetic routes may meet the needs of environmental protection, participate in the reaction in a relatively clean way, reduce waste generation, and improve atomic utilization. This feature may make it more applicable in future environmental protection-oriented industrial changes.
Although the current market may be competitive, looking at its use in important fields such as medicine and chemical industry, coupled with the help of environmental protection trends, the market prospects of succinic acid, 4-hydroxy - β - -, ethyl ester are expected to rise and occupy a place in the future industrial pattern.