Norsanguinarine (I), a new alkaloid and 6-acetonyldihydrosanguinarine (II), which appears to be an artefact, have been isolated from callus tissue of opium poppy. Sanguinarine (III), dihydrosanguinarine (IV), oxysanguinarine (V), protopine (VI), cryptopine (VII), magnoflorine (VIII) and choline (IX) have also been detected. © 1972.