<unk>  is an isoquinoline alkaloid which was discovered in 1851 by Alfred P. Durand. Hydrolysis of<unk>  yields<unk> ne, which was patented by Bayer as a haemostatic drug during the 1910s. It is present in Hydrastis canadensis (thus the name) and other plants of the family Ranunculaceae.
Hydrastine
Acebutolol
Ebastine
Dihydroergotamine
Pemirolast
Papaverine
Azelastine
Prazosin