- an alkaloid, C21H21NO6, that is extracted from the roots of goldenseal and forms prismatic crystals: used as an astringent and to inhibit uterine bleeding.
- a white poisonous alkaloid extracted from the roots of the goldenseal: has been used in medicine (in the form of one of its water-soluble salts) to contract the uterus and arrest haemorrhage. Formula: C 21 H 21 NO 6
