Showing structure for 2-{4-hydroxy-1,4a-dimethyl-8-[(2-methylbut-2-enoyl)oxy]-2,5-dimethylidene-3-oxo-tetrahydro-4h-naphthalen-1-yl}-1-(3-hydroxy-5-oxooxolan-3-yl)ethyl 2-methylbut-2-enoate