Showing structure for 6,7,16,17-tetramethoxy-10,20-dioxapentacyclo[11.7.0.0³,¹¹.0⁴,⁹.0¹⁴,¹⁹]icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaene-2,12-diol