Studies on the constituents of the seeds of Cassia obtusifolia Linn. The structures of three new anthraquinones.

Abstract

Three new anthraquinones, 1-desmethylchryso-obtusin (4), 1-desmethylobtusin (5) and 1-desmethylaurantio-obtusin (6), were isolated along with chrysophanol-10, 10'-bianthrone, questin and benzoic acid from the seeds of Cassia obtusifolia LINN., and their structures were established on the basis of spectral and chemical evidence.