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