A bitter-tasting yellow alkaloid, C20H19NO5, obtained from several plants such as goldenseal and having medical uses as an antipyretic and antibacterial agent.

• 黄连素，小檗碱一种带苦味的黄色生物碱，c20h19no5，从如白毛茛的几种植物中提取，作为解热剂和杀菌剂而入药