From the fraction of quaternary alkaloids, obtained from the roots or the overground parts of Chelidonium majus L., magnofiorine or (-)-a-stylopine methohydroxide and (-)-P-stylopine methohydroxide, respectively, were isolated in the form of iodides. The weakly basic non-quaternary fraction from the root yielded dihydrosanguinarine, dihYdrochelerythrine and the new alkaloid dihydrochelirubine in addition to oxysanguinarine. Further a small amount of dihydrochelilutine and N-demethyl-9,1O-dihydrooxysanguinarine (compound X) was also detected.