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handelin [Supplementary Concept]
Chinese drug isolated from flowers of Chrysanthemum indicum L.; structure given in first source
Date introduced: August 19, 1987
Terpenes
A class of compounds composed of repeating 5-carbon units of HEMITERPENES.
Organic Chemicals
A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.
Year introduced: 1998
Hydrocarbons
Organic compounds that primarily contain carbon and hydrogen atoms with the carbon atoms forming a linear or circular structure.