Showing structure for methyl 3,4,10-trihydroxy-1,16-dimethyl-11,19-dioxo-6,12,20-trioxahexacyclo[13.7.0.0²,⁸.0⁵,⁹.0⁸,¹³.0¹⁷,²¹]docosa-17,21-diene-5-carboxylate