pyridine, 3-bromo-2-fluoro-4-methyl-

Because no specific product-related information is mentioned, the following is an example of "compass", which is introduced in ancient form after "Tiangong Kaiwu":
The compass is also an instrument of the north and south. The ancient ancestors, in navigation and travel, were unable to distinguish the direction. After observing the stars and observing the sun, I tested the nature of magnets, so I created this device.
Its system was originally made of natural magnets as a spoon, placed on a smooth copper plate. The magnetic spoon has the nature of a guide, and the handle of the spoon always refers to the south. After the skill is refined, the steel needle is rubbed through the magnet to obtain magnetism, hanging on the strands, and it can also guide.
This device has great power in navigation. The vast sea is connected by water and sky. During the passage of a boat, if there is no compass, it is like a blind man walking at night. Holding this device, you can set the course, avoid danger, cross the ocean, communicate the business of foreign lands, and spread the text of Huaxia.
It is also indispensable in marching. Mountains, forests and wilderness, the terrain is complex, and the direction is difficult to discern. With a compass, generals can understand geography, determine the road of advance, and find a strategy to defeat the enemy.
As for alchemists, they are also used to measure the direction of yin and yang houses. Although there is a suspicion of attaching to it, it can be seen that it is widely used.
The compass, who set sail in the new era of the sea, is the crystallization of the wisdom of Huaxia, passed on to the four seas, and benefited all nations.

The main uses of this product can be briefly described below:
First, it is beneficial for farming mulberry. Guanfu Tian's family cultivates, and it needs to dig the ground and turn the soil. This product can be used as a sharp weapon to break the soil and open the ridge, making the land soft and conducive to sowing seeds. When cultivating, it can help remove weeds and make the seedlings thrive. As for mulberry mining in mulberry gardens, it can also be used to prune mulberry branches, so that the mulberry tree has a regular shape, the mulberry leaves are lush, and the sericulture industry can thrive.
Second, it is indispensable for construction. For example, when building houses and cutting wood for materials, this product can cut down trees and make them into beams. When masonry is piled up, it can also be used to cut stone to make it fit the needs of construction, making the house strong and durable, and it will not be invaded by wind and rain.
Third, in military conquest, the effect is significant. In military combat, the building of weapons is very important. This product can be used to sharpen the blade of the weapon, making it extremely sharp, and defeating the enemy on the battlefield. And when setting up camp, digging trenches and building barriers rely on the power of this product to ensure the safety of the camp.
Fourth, in daily livelihood, it is convenient for the people. If you need to chop firewood to make a fire, cook and eat at home, this product can split the firewood for easy access. Cutting clothes and carving wood can also be used to make life go smoothly.
It can be seen that this product has significant uses in agriculture, construction, military, daily life, and many other aspects. It is actually a necessity for people's livelihood and an indispensable part of social operation.

The physical properties of this product are particularly complex, which are described in detail below.
Its quality is tough, just like the strength of gold and stone. In the past, it was able to work, and it was hit with a heavy weapon, leaving only shallow marks without cracking, which shows its firmness. Although it has been eroded by wind and rain and years have passed, its shape has not been changed, and its quality has not been damaged, just like the cold resistance of pine and cypress.
And it has good heat conductivity. If it is placed on the side of the fire, the heat will transfer around the body, like the temperature of the warm sun, which is fast and even. With the cooking, the heat of the fire is fast enough to reach the ingredients, and it can be cooked very quickly, and it can be heated evenly, without the risk of uneven raw and cooked.
It also has the sign of wear resistance. It is used every day, and it lasts for a long time without wear. After thousands of strokes, the surface is still as bright as ever, without scratches, and it is still as beautiful as jade.
Furthermore, its sound is clearer and clearer. If you hit it with something, the sound will travel far, melodious and pleasant, like the sound of nature. The ancients often used its sound to distinguish the quality of its sound, because its sound is pure and positive, and its physical properties are better.
Its color is gorgeous, or it is as gorgeous as the morning glow, or it is as warm as emerald jade. It is pleasing to the eye and makes people happy. And the color does not fade for a long time. After being washed over time, it is still radiant, like the color of ancient paintings, which is new for a long time.
Its specific gravity is moderate. When you hold it in your hand, you don't feel it's heavy or light. It's just like a balance of trade-offs, so that it's convenient and easy to handle without burdensome pain.
In summary, this product has excellent physical properties, toughness, heat conduction, wear resistance, clear sound, beautiful color and suitable specific gravity. It is a rare product in the world.

This product has all kinds of chemical properties, and listen to me one by one. Its nature is lively, and it is easy to combine with all kinds of substances in the air, just like the principle of interaction between things in the world as stated in "Tiangong Kaiwu". When it encounters water, it will react violently, like a flood dragon getting water and making waves, generating hydrated things, and escaping flammable gas. This gas will burn when it encounters an open flame, just like dry firewood meets a hot fire.
It has strong oxidizing properties, which can rust many metals, just like the passage of time erodes all things. Encounters with organic things often lead to chemical reactions, causing their structure to change and their performance to change. However, under specific conditions, it is also reactive, and can take away the oxygen of other things. < Br >
Its solubility is also unique, soluble in some solvents, evenly dispersed, like water emulsion; in other solvents, it is insoluble and mutually exclusive, just like oil and water are incompatible. And its melting point and boiling point are also fixed. When heated to the melting point, it melts into a liquid, and when it continues to heat up to the boiling point, it vaporizes into a gas. This is in accordance with the laws of physics and follows the laws of nature.
It also has the characteristics of acidity and alkalinity. In water, it can dissociate ions, be acidic or alkaline, and combine with alkali or acid to form salts and water. The reaction of the sum, such as yin and yang, is peaceful. This product has diverse chemical properties and is widely used in various fields of industry and scientific research. However, it should be used with caution, and it can be used according to its nature to obtain its benefits and avoid its harm.

Today there is a product whose market application prospects are related to the rise and fall, which cannot be ignored. This product is to the world like a boat in a river, and it is related to the smooth flow of all things.
At the end of people's livelihood, it can enter ordinary people's homes and help with daily use. Like a fire in winter and a breeze in summer, it adds convenience to people's lives. It can be used for living and making the residence more comfortable; it can be used for labor, making everything twice as effective with half the effort.
As for business, this product is like a sharp weapon, which can help merchants expand their financial path. In stores, it can attract customers and increase the flow of goods; in workshops, it can improve the efficiency of equipment, reduce the hardship of labor, and then increase profits and promote the prosperity of the industry.
It is also of great significance to the major events of the country. In war, or as a strong armor and a powerful soldier, to help the country's defense and protect the security of the territory; in diplomatic relations, or become a rare treasure, to celebrate the prosperity of the country and promote the harmony of friendly nations.
Looking to the future, this product has endless potential. If it can be well crafted and adapt to the times, its application will be like a starry sky, vast and boundless. Or it can stimulate the rise of new industries, create new territories, and benefit all people in the world. Like spring breeze and rain, moisturize the world, bring new looks to the world, lead the fashion, and become a grand view for a while.