Showing structure for (1s,2s,3r,4r,6r,8r,11r,13s)-6-methyl-2-(2-oxopropyl)-16-oxapentacyclo[13.2.2.0¹,¹³.0³,¹¹.0⁴,⁸]nonadec-9-ene-7,17,18-trione