Showing structure for methyl 3-[11,15-dimethyl-14-(6-methyl-7-oxohept-5-en-2-yl)-5-methylidene-6-oxo-7-oxapentacyclo[8.7.0.0¹,³.0⁴,⁸.0¹¹,¹⁵]heptadecan-3-yl]propanoate