2-[(4-nitrobenzyl)sulfanyl]-1,3-benzothiazole

"Tiangong Kaiwu" has a saying: "Sulfur is pure yang, nitrate is pure yin, the two essences are forced together, and the sound becomes a change. This universe hallucinates a god." Nitrate is saltpeter, sulfur is sulfur, sulfur and saltpeter will produce violent chemical changes, which is the main ingredient of gunpowder.
Sulfur, its yellow color, warm nature, flammable, sour taste and special odor. "Compendium of Materia Medica" contains: "Sulfur has the essence of pure yang, the nature of great heat, and can make up for the lack of real fire in the gate of life." It is produced in nature and often exists in hot springs, craters and other areas.
Saltpeter, white or colorless, slightly salty and bitter in taste, cold in nature, and strongly oxidizing. In ancient times, it was mostly extracted from soil containing nitrate. In the gunpowder formula, saltpeter is an oxidizing agent, and sulfur is a combustible substance. The two are mixed in a specific ratio, and then charcoal is added to form the basic formula of gunpowder.
In gunpowder, the properties of sulfur and saltpeter cooperate with each other. When it encounters a fire source to initiate a reaction, saltpeter releases a large amount of oxygen, causing the sulfur and charcoal to burn violently, generating a large amount of gas and heat in an instant, which triggers an explosion. This is the main physical property change when sulfur and saltpeter are mixed. The interaction between the two makes a great invention that changed the course of world history - gunpowder.

"Tiangong Kaiwu" says: "The saltpeter and sulfur are both the essence of yin, and they are poisonous. Nitrate to yin, sulfur to yang, the two gods of yin and yang meet in a seamless and tolerable state. When it comes out, the characters are taken by it, and the soul is scattered and the soul is shocked." These two are the key ingredients of gunpowder.
Saltpeter, chemically called potassium nitrate ($KNO_3 $), its color is white or yellowish, like frost and snow, salty and cold, mostly born in rock caves or saline-alkali areas. Its chemical properties are active, and it can be decomposed by heat to produce oxygen, providing combustion support conditions, and is an oxidizer in gunpowder. In gunpowder formulas, saltpeter provides oxygen, which prompts other ingredients to burn rapidly, which in turn releases a lot of energy.
Sulfur, that is, sulfur element ($S $), is yellow and brittle, with a special odor, and often occurs near volcanic craters or around hot springs. Its chemical properties are more active. In gunpowder, sulfur is not only used as a fuel to provide the energy required for combustion, but also reduces the activation energy of the reaction between charcoal and saltpeter, making gunpowder easier to ignite, and can enhance the stability and reaction rate of gunpowder during combustion.
When the two meet, add charcoal and other substances, and mix them in a specific ratio to form gunpowder. This chemical reaction is violent, releasing huge energy in an instant, and can be used for military weapons, fireworks, etc. It is powerful and has a wide range of uses, leaving a strong mark on the process of human civilization.

"Tiangong Kaiwu" has a saying: "Where indigo has more leaves and stems, it goes into the cellar, and the less goes into the bucket and tank. Soak in water for seven days, and the juice will come. One stone per pulp, five liters of lime are added, and it is stirred dozens of times, and the letter will form. The water is timed, and it sinks at the bottom... Those who plunder the floating foam and dry it are called indigo flowers."
The method of making indigo involves many steps. First take the plants containing indigo ingredients, such as polygonum blue, isatis blue, etc. If there are more leaves and stems, they will be placed in the cellar; if there are less, they will be placed in a bucket or tank. Soak in water, it will take about seven days, during which the plant ingredients gradually dissolve in water, and the juice will
After that, five liters of lime need to be added to each lime slurry. After the lime is added to the slurry, it is quickly stirred dozens of times. This step is quite critical. Because the stirring prompts a chemical reaction to occur, the blue indigo components are separated from the impurities, and the sediment is formed. When the water is ready, the blue indigo will sink to the bottom, and this precipitation is blue indigo. The foam that comes out of the water surface is called indigo flower after drying, and it is also a useful thing.
In this way, the method of making blue indigo is obtained. This is the embodiment of the wisdom of the ancients in the field of dye production, which has been passed down to future generations and has many benefits.

I look at your words, the first sentence "2 -% 5B% 284 - aminopyridine% 29 carboxyl% 5D - 1", this chemically related expression seems to be talking about the structural components of a substance, but the expression is slightly messy, and more clear and standardized chemical symbols and descriptions are needed.
As for "3-sulfadiazine is used in what fields?" This question, sulfadiazine is widely used. In the field of medicine, it is an important antibacterial drug. Because it can inhibit the synthesis of bacterial folic acid, it has antibacterial activity against a variety of Gram-positive and negative bacteria. It is often used in the prevention and treatment of infections caused by hemolytic streptococcus, meningococcus, pneumococcus, etc., such as epidemic meningitis, respiratory tract infections, urinary tract infections and other diseases.
In the field of animal husbandry, it is also useful. It can be used to prevent and treat bacterial infectious diseases of livestock and poultry, protect the health of livestock and poultry, and improve the efficiency of breeding.
In agriculture, although not widely used, in the prevention and control of specific crop diseases, if the relevant bacteria are sensitive to it, it may also have certain uses, which can help protect crops and reduce disease losses.
"Tiangong Kaiwu" If the application of sulfadiazine is discussed, with the level of science and technology at that time, there is no such understanding. However, "Tiangong Kaiwu" is an ancient book that records many crafts and technologies, among which metallurgy, pottery, textile and other crafts all show the wisdom of the ancients. If the ancients could know sulfadiazine, with its spirit of exploring and applying to all things in the world, or would also study its potential uses in treating diseases, saving people, and protecting people's livelihood, etc., then this is all imaginary. Due to the limitations of the times, there are no such chemical drugs at that time.

"Tiangong Kaiwu" shows that in Western countries, glass is widely used, and its quality is uniform, unlike that of China. As for the glass made of borax and saltpeter, its color is bright white, which is the long skill of the Westerners. However, in the land of China, ceramics are popular, and their exquisite skills are beyond the reach of other states.
Looking at the market conditions of glass and ceramics, at that time, ceramics were prosperous all over the world. From the court to the people, ceramics were used for use, or to hold things, or to decorate, with a wide variety of categories and superb skills. Official and dignitaries mostly use exquisite ceramic utensils to show their identities; ordinary people also use practical ceramics to meet their daily needs. Therefore, the ceramic market is bustling and trading is endless.
In contrast, glass, although introduced from the West, has not yet been popularized in China. At that time, the people mostly used ceramics as a habit, and the cognition and demand for glass were still in its infancy. Glass is mostly enjoyed by rich families, or used for some special places, such as dioramas. Its manufacturing process has not been widely spread among the people, and only a few workshops know it. Therefore, although the glass market is novel, it is still small in scale, and it is difficult to compete with ceramics.
In general, in China at that time, the ceramic market was prosperous and prosperous, and the glass market was a little young. It will take time before it can be widely used by people and keep pace with ceramics.