Crystal structure of 22,24,25-trimethyl-8,11,14-trioxa-25-aza­tetra­cyclo­[19.3.1.0(2,7).0(15,20)]penta­cosa-2,4,6,15(20),16,18-hexaen-23-one

The title compound, C(24)H(29)NO(4), is the product of a Petrenko–Kritchenko condensation of 1,5-bis­(2-formyl­phen­oxy)-3-oxa­pentane, pentan-3-one and methyl­ammonium acetate in ethanol. The mol­ecule has mirror symmetry. The aza-14-crown-3 ether ring adopts a bowl conformation stabilized by a weak intra­molecular C—H⋯O hydrogen bond. The conformation of the C—O—C—C—O—C—C—O—C polyether chain is t–g(+)–t–t–g(−)–t (t = trans, 180°; g = gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72.68 (4)°. The piperidinone ring adopts a chair conformation. The nitro­gen atom has a trigonal–pyramidal geometry, the sum of the bond angles being 335.9°. In the crystal, the mol­ecules are linked by weak C—H⋯O inter­actions, forming zigzag chains propagating along the [100] direction.