Showing structure for (2s,11s,16s)-17,17-dimethyl-4,12,18-trioxapentacyclo[11.8.0.0²,¹¹.0⁵,¹⁰.0¹⁴,¹⁹]henicosa-1(21),5,7,9,13,19-hexaene-7,16-diol