Synonyms: 2-Butenoicacid, 2-methyl-,1,6-dimethyl-9-(1-methylethenyl)-7-oxo-5,12-dioxatricyclo[9.1.0.04,6]dodecane-2,10-diylester, [1R-[1R*,2S*(Z),4S*,6R*,9S*,10S*(Z),11R*]]-;5,12-Dioxatricyclo[9.1.0.04,6]dodecane, 2-butenoic acid deriv.; Ligularinone A