Acetamide, 2-Iodo-

"2-pyrrolidone" is an organic compound with unique chemical properties and important uses in many fields.
From a structural perspective, this compound contains a five-membered cyclic structure with a carbonyl group and nitrogen atom, which gives it several special properties.
In terms of physical properties, 2-pyrrolidone is a colorless to light yellow transparent liquid at room temperature, with a high boiling point of about 245 ° C, and can be miscible with many organic solvents such as water, alcohol, and ether. This solubility makes it an excellent solvent, which is often used as a solvent in chemical production. It can effectively dissolve many organic and inorganic substances and facilitate the progress of chemical reactions.
Its chemical properties are active, and the presence of carbonyl groups allows it to participate in many chemical reactions. For example, nucleophilic addition reactions can occur, because the carbon atoms in the carbonyl group have a certain positive electricity and are vulnerable to nucleophilic reagents. The lone pair electrons on the nitrogen atom can also participate in the reaction, making it a base or a nucleophilic reagent. At the same time, 2-pyrrolidone can undergo ring-opening reactions under appropriate conditions, and a variety of important compounds can be derived.
In industrial production, 2-pyrrolidone is often used as a solvent and reaction medium for polymerization reactions, which helps to control the reaction process and product properties. In the field of medicine, due to its good solubility and relatively low toxicity, it can be used as a drug carrier to assist in drug dissolution and absorption. With its unique chemical properties, 2-pyrrolidone plays a key role in the chemical, pharmaceutical and other industries, providing necessary conditions for many chemical reactions and product manufacturing.

The "Second Question Silver Collar Waist" is used in many fields and has a wide range of uses.
In the official system, this is an important credential. In the past, when officials performed their duties, were banned from entering and leaving the palace, or performed specific official duties, they often needed to hold this object to prove their identity and duties. As "Zhou Li" said, "It is spread out by festival", this waist plate is similar to that of the festival at that time, providing credentials for officials to act and ensure compliance and order in their actions. And the waist plates held by officials of various grades may vary in shape and material. This is also a sign to distinguish the ranks of officials and maintain court etiquette and order.
In the military field, it also plays a key role. When a general in the army deploys troops and passes on military orders, the "second question silver collar waist tag" may be an important token. "Sun Tzu's Art of War" says that "wherever you govern the multitude, you govern the widow, the score is also; if you fight the multitude, you will fight the widow, and the name is also". The waist tag is here or something similar to the name. The general uses it to indicate his identity and convey instructions, so that the army can act uniformly and the order is prohibited. Only with this waist tag can you ensure the smooth flow of military orders and avoid the risk of counterfeiting orders, which is related to the success or failure of the war.
It also plays a certain role in the level of commercial and trade exchanges. Merchants travel long distances and carry goods to trade in various places. This waist tag may prove their business reputation and identity. In a specific business gang or chamber of commerce organization, holding such waist tags may mean being recognized and trusted, which is conducive to their trade activities and signing contracts. For example, in the Ming and Qing Dynasties, Jin merchants, Hui merchants and other business gangs, there may be similar markers inside to ensure the orderly conduct of business activities. "Second Question Silver Collar Waist" or similar, to provide assistance for the smooth development of business activities.

The preparation method of "Erwei Ginkgo biloba" is related to the processing method of traditional medicine. Although this specific "Erwei Ginkgo biloba" is not detailed in "Tiangong Kaiwu", it can be deduced according to its similar processing principles and ancient medicine methods.
Ginkgo biloba, also known as ginkgo, is sweet, bitter, astringent, flat, and poisonous; it has been used as medicine for a long time. When processing "Erwei Ginkgo biloba", the first thing to choose is the ginkgo fruit, which is ripe and plump without insects eating and rotting. Then, remove its outer seed skin, which often has a peculiar smell and may contain irritating ingredients. Remove the shell and take the kernels, and pestle them lightly in the mortar to break them moderately, so that they can be processed and tasted later.
As for the other flavor, or with other medicines to control its toxicity and increase its medicinal effect. If you add warm medicines, you can make the cold astringency of ginkgo. If you add a small amount of dried ginger, dried ginger is refreshing and hot, and has the power of warming and dissipating cold, returning to the sun and opening the veins. First slice the dried ginger, soak it in water to soften, put it in a pot with white nuts, add an appropriate amount of water, and cook slowly. The amount of water should be less than the medicinal materials. Cook for about half an hour, until the white nuts are soft and waxy and absorb the taste of dried ginger.
After cooking, remove the medicinal materials, drain the water, and dry in a ventilated and dry place. During the drying process, it is necessary to prevent flies and insects, and often turn it over to make it evenly dry. After it is completely dry, put it in a porcelain jar or cloth bag and place it in a cool and dry place to prevent moisture and moth. The "Erwei Ginkgo Ginkgo" prepared in this way may be less toxic and effective. It can be used for the treatment of corresponding diseases according to medical principles, but the medicine still needs to be prescribed by the doctor and cannot be used without authorization.

There are the following precautions in the use of "Erwei Disinfection Powder":
First, the dosage of the medicine needs to be precisely controlled. Although this powder has significant effect, although the taste is simple, the medicinal power is special. If the dosage is improper, it may be difficult to achieve the expected effect or cause adverse reactions. In case of mild symptoms of sores, the dosage should be light to prevent overdose and injury; if the disease is urgent and severe, you can increase the dosage as appropriate, but be sure to follow the doctor's advice, and do not increase or decrease it at will.
Second, the timing of administration is quite critical. Erwei Disinfection Powder is mostly used when sores begin to appear, when the appearance of redness, swelling, heat and pain first appears. Use it at this time to dissipate the poison and evil in time and control the progress of the disease. If the timing is delayed, the sore has been ulcerated, or the disease has been delayed for a long time, and the righteousness is already deficient. It is difficult to use this alone to dissipate fear and play a full role. It needs to be treated in combination with other methods of syndrome differentiation.
Third, pay attention to the medication site. This medicine is mainly used externally and applied to the affected area. However, different parts of the skin have different degrees of tolerance. For example, where the skin is thin and fleshy, such as the head, face, neck, etc., the medication should be gentle and the concentration should not be too high to prevent irritation to the skin; and where the skin is thick and the flesh is strong, such as the limbs and waist, the medication can be slightly heavier. At the same time, if there is rupture or exudation in the medication site, the sore surface should be cleaned first, and then the
Fourth, closely observe the reaction. Pay attention to local and systemic reactions after taking the drug. If the local redness, swelling, heat and pain subside after taking the drug, indicating that the drug syndrome is consistent, you can continue to use it; if there is local itching and rash, or adverse reactions such as systemic fever, aversion to cold, dizziness, etc., you should stop using it immediately, and take corresponding measures to seek medical treatment if necessary.
Fifth, the preservation of the drug should not be ignored. Erwei Disinfection Powder should be placed in a dry and cool place to avoid moisture and heat to prevent the drug from deteriorating and affecting the efficacy. If you find abnormal changes in the smell, color, etc. of the drug during use, do not use it again.

"Two-Question Yulu Nongjang", the price state in the market, often varies according to time, place and quality. In the past, the court tribute "Two-Question Yulu Nongjang", the selection of materials is strict, the brewing art is complicated, and its price is extraordinary. Non-giants and nobles cannot ask for it. The value of each jar may be worth more than a hundred gold.
In the market, the usual "Two-Question Yulu Nongjang", according to the rank of the wine shop and the length of the brewing period, the price varies. The home of fine wine, with aging as its honor, the longer the years, the more mellow the fragrance, and the price is also high. Or there is a new grain wine, the taste is slightly thinner, the price is cheap, and a pot can be sold for a few dollars.
If you are in the city of Tongdu, a prosperous place, due to the heavy tax and the large number of business travelers, the price is often higher than that of remote soil. And every New Year's celebration, the demand increases sharply, and the price also rises. On the contrary, in the hometown of wine production, due to the abundance of production, the supply exceeds the demand, and the price may fluctuate.
Also, the quality of the "second question jade dew nectar" is related to the choice of rice and wheat, the wonders of curling tillers, and the method of cellaring. High-quality wine, sweet in the mouth, long in the aftertaste, and high in price; if it is of inferior quality, the taste is few and astringent, and the price is low. Therefore, if you want to know its market price, you must check the time and place, and examine its quality, so that you can be sure.