19-[(<i>E</i>)-4-Chlorobenzylidene]-16-(4-chlorophenyl)-2-hydroxy-1,11-diazahexacyclo[15.3.1.0<sup>2,10</sup>.0<sup>3,8</sup>.0<sup>10,17</sup>.0<sup>11,15</sup>]henicosa-3(8),4,6-triene-9,18-dione
Acta crystallographica. Section E