장뇌, whose IUPAC name is 1,7,7-trimethylbicyclo[2.2.1]heptan-2-one, is a terpenoid organic compound with a chemical formula of C10H16O. It is a white or transparent waxy solid at room temperature and can be used to repel insects. 장뇌 is extracted from the trunk of 장뇌 tree. The older the 장뇌 tree, the more 장뇌 is in it. The extraction method is to cut the tree trunk into small pieces and distill it with water. After the 장뇌 oil is heated, it rises with water vapor, and it can form 장뇌 when it comes into contact with the pottery jar placed above to cool it. In the early days of northern Taiwan, the mountain forests were mostly primitive 장뇌 forests, and many old 장뇌나무는 천년이 넘었습니다. 나중에 일본 정부는장뇌 for export in Taiwan. Therefore, Taiwan's 장뇌 export once reached the first place in the world. Most of the mothballs used in the world are synthesized chemically.This substance may be harmful to the environment, and special attention should be paid to water bodies.Store in a sealed, ventilated, dry place, avoid contact with other oxides.