Showing structure for 3-[5,10,14-trimethyl-6-(2-methyloxiran-2-yl)-3,8-dioxo-14-(3-oxopentyl)-15-oxatetracyclo[8.6.0.0¹,¹³.0⁴,⁹]hexadec-4(9)-en-5-yl]propanoic acid