New pentacyclic triterpenic esters from the roots of Calotropis gigantea

Phytochemical studies on the roots of Calotropis gigantea resulted in the isolation of one new lupene type triterpene identified as lup-13 (18), 19 (29)-dien-9 alpha-yl acetate and lupeol acetate and two new ursane type triterpenes characterized as urs-18 beta-H-12, 20(30)-dien-3 beta-yl acetate and 17 beta-hydroxy-28-normethyl urs-18 alpha-H-12, 20 (30)-dien-3 beta-yl acetate on the basis of spectral data analyses and chemical reactions.