24-Acetyl-8,11,14-trioxa-24,27-diaza­penta­cyclo­[19.5.1.1(22,26).0(2,7).0(15,20)]octa­cosa-2,4,6,15(20),16,18-hexaen-28-one

The title compound, C(25)H(28)N(2)O(5), is a product of the Petrenko–Kritchenko condensation of N-acetyl­piperidone with 1,5-bis­(2-formyl­phen­oxy)-3-oxapentane and ammonium acetate. The mol­ecule comprises a fused penta­cyclic system containing an aza-14-crown-3-ether macrocycle, two piperidone and two benzene rings. The aza-14-crown-3-ether ring adopts a bowl conformation. The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether unit is 70.18 (4)°. The central piperidone ring has a boat conformation, whereas the terminal piperidone ring adopts a chair conformation. The conformation of the central piperidone ring is determined by two intra­molecular N—H⋯O hydrogen bonds. In the crystal, mol­ecules are linked by weak C—H⋯O inter­actions into chains along [010].