New ursane triterpene from the fruits of Terminalia arjuna.

A new ursane triterpene, torment (2 alpha,3 beta,19 alpha-trihydroxyurs-12-en) (1), was isolated from the fruits of Terminalia arjuna along with four known ursane and oleane triterpenes. The structures were established on the basis of extensive NMR (1D & 2D) and MS (EI & ESI) studies. Tormentic acid (2), 19 alpha-hydroxy asiatic acid (3) and olean-12-en-2 alpha,3 beta-diol (4) were isolated for the first time from this species.