New pentacyclic triterpenes from the roots of Hemidesmus indicus.

Phytochemical studies on the roots of Hemidesmus indicus resulted in the isolation of six new pentacyclic triterpenes including two oleanenes identified as olean-12-en-21 beta-yl acetate, and olean-12-en-3 alpha-yl acetate, three ursenes characterized as 16(17)-seco-urs-12,20(30)-dien-18 alpha H-3 beta-yl actetate, urs-20(30)-en-18 beta H-3 beta-yl acetate and 16(17)-seco-urs-12,20(30) dien-18-alpha H-3 beta-ol and a lupene formulated us lup-1,12-dien-3-on-21-ol including a known compound, beta-amyrin acetate, on the basis of spectroscopic techniques and chemical means.