Senecivernine is a natural product of Senecio, Asteraceae. Senecivernine can be used as a reference standard.

Piprozolin (W 3699) is a new type of choleretic acid that shows slight analgesic properties at high doses during chronic experiments.Piprozolin has a slight induction of certain enzymes of the oxidative system.

Viscidulin I 存在于黄芩中。