(1R*,21S*,22R*,24S*)-Methyl ethyl 2-[23-hy­droxy-22,24-diphenyl-8,11,14-trioxa-25-aza­tetra­cyclo­[19.3.1.0^2,7.0^15,20]penta­cosa-2,4,6,15(20),16,18-hexaen-25-yl]but-2-enedioate

The title compound, C₄₀H₄₁NO₈, is a product of the reduction of the cyclic carbonyl group of the γ-piperidone subunit of the aza-14-crown-4 ether with subsequent re-esterification of its dimethyl butenoate substituent into a monoethyl monomethyl group. The aza­crown macrocycle exhibits a bowl conformation with a dihedral angle of 70.82 (5)° between the benzene rings fused to it. The piperidine ring adopts a chair conformation and the methyl ethyl ethyl­enedi­carboxyl­ate fragment has a cis conformation, with a dihedral angle of 66.51 (7)° between the two carboxyl­ate groups. The ethyl group is disordered over two sites with occupancies of 0.70 (1):0.30 (1). In the crystal, mol­ecules form inversion dimers, via pairs of O—H...O hydrogen bonds, that stack along the a axis.