Showing structure for 7,15-dihydroxy-2,11,20,21-tetramethoxy-5,17-diphenyl-4,12,18-trioxapentacyclo[11.8.0.0²,¹¹.0³,⁸.0¹⁴,¹⁹]henicosa-1(21),3(8),13,19-tetraen-9-one