Showing structure for 3,9-dihydroxy-7-methoxy-17-methyl-16,21-dioxapentacyclo[15.3.1.0²,¹⁵.0⁴,¹³.0⁶,¹¹]henicosa-2,4(13),6(11),7,9,14-hexaene-5,12-dione