Lupane-triterpene esters from the leaves of Ceriops decandra (Griff.) Ding Hou

Two novel triterpene esters were isolated from the leaves of Ceriops decandra in addition to 16 known triterpenes: lupenone 3, lupeol 4, betulinaldehyde 5, 3 beta-Z-coumaroyllupeol 6, 3 beta-E-coumaroyllupeol 7, 3-epi-betulinic acid 8, betulin 9, betulinic acid 10, 3 beta-E-feruloylbetulin 11, 30-nor-lup-3 beta-ol-20-one 12, 3 beta-E-caffeoyllupeol 13, lup-20(29)-en-3 beta,30-diol 14, 3 beta-hydroxylupan-29-oic acid 15, 3 beta,20-dihydroxylupane 16, and a mixture of oleanolic and ursolic acid 17 and 18. The new compounds were determined by spectroscopic methods to be 3 beta-E-feruloyllupeol 1 and 3 beta-Z-feruloyllupeol 2. Compounds 3 and 5-16 were reported for the first time as metabolites of C. decandra.