Showing structure for (1s,13r)-7,7-dimethyl-8,12,20-trioxapentacyclo[11.8.0.0²,¹¹.0⁴,⁹.0¹⁴,¹⁹]henicosa-2(11),3,5,9,14,16,18-heptaene-1,17-diol