Showing structure for 6,7,18,19-tetramethoxy-10,15-bis(4-methoxyphenyl)-9,12,16-trioxapentacyclo[11.7.1.0²,¹¹.0³,⁸.0¹⁷,²¹]henicosa-1(21),3(8),4,6,17,19-hexaen-14-yl acetate