Showing structure for 3-[(1r,5s,6r,10s,13s,14s)-5,10,14-trimethyl-6-[(2s)-2-methyloxiran-2-yl]-2,3,8-trioxo-14-(3-oxopentyl)-15-oxatetracyclo[8.6.0.0¹,¹³.0⁴,⁹]hexadec-4(9)-en-5-yl]propanoic acid