Showing structure for (1r,2r,4ar,5s,8ar)-5-hydroxy-1,8a-dimethyl-6-oxo-7-(propan-2-ylidene)-hexahydro-1h-naphthalen-2-yl (2z)-3-methyl-4-{[(2z)-2-methylbut-2-enoyl]oxy}but-2-enoate