A colorless or white crystalline alkaloid, C17H21NO4, extracted from coca leaves, sometimes used in medicine as a local anesthetic especially for the eyes, nose, or throat and widely used as an illicit drug for its euphoric and stimulating effects.

• 古柯碱，可卡因无色或白色结晶生物碱，C17H21NO4，从古柯叶中提取，有时用作局部麻醉药，尤其用于眼睛、鼻子或喉咙，还因其兴奋性和刺激性而广泛用作非法毒品