Showing structure for (1r,2r,3s,5r,8r,11r,14s,17r,20s)-3-hydroxy-14-methyl-6-methylidene-10,16,18-trioxahexacyclo[12.5.1.1⁵,⁸.0¹,¹¹.0²,⁸.0¹⁷,²⁰]henicosane-7,9-dione