New coumaronochromones from white lupin, Lupinus albus L. (Leguminosae).

A further investigation of the isoflavonoid constituents occurring in roots of the white lupin (Lupinus albus L. cv.KievskijMutant) has yielded five new coumaronochromones named lupinalbin A (la), B (2a), C (3), D (4) and E (5).These isoflavonoids were identified by physicochemical methods involving the use of biogenetically related 2'-hydroxyisoflavones as reference compounds.The presence of the rare dihydrofurano-isoflavone, erythrinin C (16), in white lupin roots has also been established.