A poisonous, bitter, crystalline alkaloid, C17H23NO3, obtained from belladonna and other related plants. It is used to dilate the pupils of the eyes and as an antispasmodic.

• 阿托品，颠茄碱一种有毒、味苦的结晶生物碱，C17H23NO3从颠茄或其它茄科植物中提取而得。用于扩大瞳孔，治疗痉挛