Synonyms: 2-Heptenoicacid,6-[(1'R,2'S,5aR,9aR,9bS)-1,2,5,5a,6,7,8,9,9a,9b-decahydro-2',6,6,9a-tetramethyl-5'-methylene-7-oxospiro[3H-benz[e]indene-3,1'-cyclopentan]-2'-yl]-2-methyl-4-oxo-,(2E,6R)- (9CI); 8,13-Cyclo-18-nor-8,14-secodammara-7,14(30),24-trien-26-oicacid, 17-methyl-3,23-dioxo-, (9b,13R,17a,24E)-;2-Heptenoic acid,6-(1,2,5,5a,6,7,8,9,9a,9b-decahydro-2',6,6,9a-tetramethyl-5'-methylene-7-oxospiro[3H-benz[e]indene-3,1'-cyclopentan]-2'-yl)-2-methyl-4-oxo-,[3R-[3a[S*(2E,6R*)],5ab,9aa,9ba]]-; Mariesiic acid C