Showing structure for (4z,6e)-7-[(1r,2e,4as,6s,7r,8r,8ar)-7-hydroxy-2-(3-hydroxy-2-oxopropylidene)-3,6,8-trimethyl-4a,5,6,7,8,8a-hexahydro-1h-naphthalen-1-yl]-4,6-dimethylhepta-2,4,6-trienoic acid