Showing structure for 6-[6,10-dimethyl-14-oxo-17-(prop-1-en-2-yl)-13-oxapentacyclo[10.4.2.0¹,³.0³,¹¹.0⁶,¹⁰]octadec-7-en-7-yl]-2-methylhepta-2,6-dienoic acid