Showing structure for (5s,7r,10r,11r,15r,17s)-15-hydroxy-2,7,10,11,20,21-hexamethoxy-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