Showing structure for (2s,10s)-17,17-dimethyl-3,12,18-trioxapentacyclo[11.8.0.0²,¹⁰.0⁴,⁹.0¹⁴,¹⁹]henicosa-1(13),4,6,8,14(19),15,20-heptaene-6,10-diol