Showing structure for (2e,4e,6e,8e)-9-[(1s,2s,4as,5s,6s,8ar)-2-[(2e)-but-2-en-2-yl]-5-hydroxy-3-(hydroxymethyl)-1,6-dimethyl-4a,5,6,7,8,8a-hexahydro-2h-naphthalen-1-yl]nona-2,4,6,8-tetraenoic acid