Registre de correu electrònic: 16-[(E)-Benzyl­idene]-2-hy­droxy-12,13-diphenyl-1,11-diaza­penta­cyclo­[12.3.1.0(2,10).0(3,8).0(10,14)]octa­deca-3(8),4,6-triene-9,15-dione