Dammarane triterpenes from the hypocotyls and fruits of Ceriops tagal

Three new dammarane triterpenes, cereotagaloperoxide (1), cereotagalol A (2), and cereotagalol B (3), together with four known dammarane triterpenes, an oleanane triterpene, and 13 known lupane triterpenes were isolated from the hypocotyls and fruits of Ceriops tagal. The structures of 1-3 were characterized on the basis of their spectroscopic data.