Showing structure for (3e)-5-[(1s,2r,4ar,8as)-1,2,4a,5-tetramethyl-2,3,4,7,8,8a-hexahydronaphthalen-1-yl]-3-[(3-{2-[(1s,2r,4ar,8as)-1,2,4a,5-tetramethyl-2,3,4,7,8,8a-hexahydronaphthalen-1-yl]ethyl}-2,5-dioxopyrrol-1-yl)methylidene]pentanoic acid