Three new dammarane triterpenes, cereotagaloperoxide, cereotagalol A, and cereotagalol B, 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.

Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.004 Å Disorder in main residue R factor = 0.048 wR factor = 0.134 Data-to-parameter ratio = 10.1For details of how these key indicators were automatically derived from the article, see

The title compound, C40H58O4, a lupane triterpene, was isolated from the hypocotyls of Ceriops tagal (Perr.) C. B. Robinson. There are two crystallographically independent mol­ecules in the asymmetric unit. In both mol­ecules, the cyclo­pentane ring adopts an envelope conformation. The mol­ecular structure is stabilized by O—H⋯O and C—H⋯O hydrogen bonds. C—H⋯O inter­molecular hydrogen bonds link the mol­ecules into chains along the a axis.

Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.002 Å R factor = 0.041 wR factor = 0.106 Data-to-parameter ratio = 14.3For details of how these key indicators were automatically derived from the article, see