New ursane-type triterpenic esters from the stem bark of Thevetia peruviana.

Phytochemical studies on the stem bark of Thevetia peruviana resulted in the isolation of six new ursane-type triterpenes, named peruvianursenyl acetate A, peruvianursenyl acetate B, isolupenyl acetate, peruvianursenyl acetate C, lupedienyl acetate and peruvianursenyl glucoside along with two known triterpenoids, namely alpha-amyrin acetate and lupeol acetate. The structures of the new phytoconstituents have been established as 23--nor methyl urs-12-en-4 alpha-ethylenic-18 alpha-H-3 beta-yl acetate, urs-5.21-dien-18 alpha-H-3 beta-yl acetate, lup-20 (29)-en-3 alpha-yl acetate, urs-12 en-18 alpha-H-3 beta-yl acetate, lup-5,20 (29)-dien-3 beta-yl acetate, and urs-12-en-18 alpha-H-3-O-beta-D-glucopyranoside, respectively.