Ethyl 4-(2-ethoxy-2-oxoethyl)-3-oxo-4,13-diazapentacyclo[11.8.0.0<sup>2,11</sup>.0<sup>5,10</sup>.0<sup>14,19</sup>]henicosa-1,5(10),6,8,11,14(19),15,17,20-nonaene-12-carboxylate
Acta crystallographica. Section E