Azecines

Protopine is an alkaloid occurring in opium poppy, Corydalis tubers and other plants of the family papaveraceae, like Fumaria officinalis.

Cryptopine is an opium alkaloid. It is found in plants in the family Papaveraceae, including Argemone mexicana.

Allocryptopine is a bioactive alkaloid found in plants of the Papaveraceae family, including Glaucium arabicum, Argemone mexicana, Eschscholtzia, Corydalis, Fumaria, Chelidonium, Hunnemannia fumariifolia, Eschscholzia lobbii and other Papaveraceae plants.