Synonyms: 2,3-Secoolean-12-ene-3,29-dioicacid, 2-oxo-, 3-methyl ester, (20b)-; 2-Chryseneacetic acid,9-carboxy-1,2,3,4,4a,4b,5,6,6a,7,8,9,10,10a,12,12a-hexadecahydro-a,a,1,4a,4b,6a,9-heptamethyl-1-(2-oxoethyl)-, methylester, (1R,2R,4aR,4bS,6aS,9S,10aR,12aR)- (9CI); Dillenic acid D