As a drug, not a specific substance, it refers to a pharmaceutical additive that can promote the growth of clenbuterol. Any substance that can promote the growth of lean meat and inhibit the growth of fat meat can be called "lean meat". At present, substances that can achieve this function are a class of drugs called β-agonists, such as clenbuterol, which caused poisoning in China, and ractopamine/ractopamine, which is allowed to be used in the United States.

Chinese name: Clenbuterol; Clenbuterol; Clenbuterol hydrochloride; This is an antiasthmatic drug. The drug is neither a veterinary drug nor a feed additive, but an adrenal nerve stimulant. Dichloropropanol amine hydrochloride; Cough asthma element; Methotrexate; Ambutero; Ammonia dichlorochuantong; Amine dichloride alcohol amine.

Molecular formula: c12-h18-Cl2-N2-O.

White or off-white crystalline powder, odorless, bitter in taste, melting point 16 1℃, soluble in water and ethanol, slightly soluble in acetone and insoluble in ether.