Aristatosides A-C, hederagenin-type triterpene saponins from Cephalaria aristata

Three new hederagenin type triterpene saponins, namely aristatosides A-C (1-3) were isolated from Cephalaria aristata (Dipsacaceae) and two new prosapogenins (1a-2a) were obtained after alkaline hydrolysis of compounds 1 and 2.