Hydrastine
Hydrastine is a natural alkaloid which was discovered in 1851 by Alfred P. Durand. By hydrolysis of hydrastine one receives Hydrastinine, which was patented by Bayer as a haemostatic drug during 1910s.
It is naturally present in Hydrastis canadensis (thus the name) and other plants of the ranunculaceae.
Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Hydrastine". Image Credit.