Showing structure for 4-{[(2r,4ar,8r,8ar)-8-[(3e)-5-(acetyloxy)-3-methylpent-3-en-1-yl]-4,4,7,8a-tetramethyl-1,2,3,4a,5,8-hexahydronaphthalen-2-yl]oxy}-4-oxobutanoic acid