Cardiac glycosides from Beaumontia brevituba and B. murtonii were examined. Gentiobiosyl-beta-D-cymaroside and gentiobiosyl-alpha-L-cymaroside of digitoxigenin were isolated from the seeds, unripe fruits, and leaves of B. brevituba, and the leaves of B. murtonii. Oleandrigenin and/or delta
Five known cardenolides, digitoxigenin (1), oleandrigenin (2), digitoxigenin alpha-L-cymaroside (3), digitoxigenin beta-gentiobiosyl-alpha-L-cymaroside (4), and delta 16-digitoxigenin beta-D-glucosyl-alpha-L-cymaroside (5), were isolated from the stems of Beaumontia brevituba Oliver by