Protopine is a benzylisoquinoline
1-Benzylisoquinoline is a chemical compound, and the structural backbone of many alkaloids with a wide variety of structures, including papaverine, noscapine, codeine, morphine, apomorphine, berberine, protopine and tubocurarine.-Biosynthesis:...

Alkaloids are a group of naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Also some synthetic compounds of similar structure are attributed to alkaloids...

 occurring in opium poppy
Opium poppy
Opium poppy, Papaver somniferum, is the species of plant from which opium and poppy seeds are extracted. Opium is the source of many opiates, including morphine , thebaine, codeine, papaverine, and noscapine...

, corydalis
Corydalis is a genus of about 470 species of annual and perennial herbaceous plants in the fumewort family , native to the temperate Northern Hemisphere and the high mountains of tropical eastern Africa...

tubers and other plants of the family papaveraceae
Papaveraceae, informally known as the poppy family, are an economically important family of 44 genera and approximately 770 species of flowering plants in the order Ranunculales. The family is cosmopolitan, occurring in temperate and subtropical climates, but almost unknown in the tropics...

. It has been found to inhibit histamine H1 receptors and platelet aggregation, and acts as an opioid analgesic.
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