1H-​Benz[e]​indene-​6-​propanoic acid, 3-​[(1R)​-​1-​carboxy-​5-​methyl-​4-​hexen-​1-​yl]​-​2,​3,​3a,​4,​6,​7,​8,​9b-​octahydro-​2-​hydroxy-​3a,​6,​9b-​trimethyl-​7-​(1-​methylethenyl)​-​, (2R,​3R,​3aR,​6S,​7S,​9bR)​-