Showing structure for (2s,11s)-17,17-dimethyl-4,12,18-trioxapentacyclo[11.8.0.0²,¹¹.0⁵,¹⁰.0¹⁴,¹⁹]henicosa-1(13),5,7,9,14(19),15,20-heptaene-2,7-diol