Abstract
The asymmetric unit of the title compound, C20H22N2O4, comprises two crystallographically independent molecules (A and B) with slightly different geometries. The dihedral angle between the two terminal phenyl rings is 61.7 (1)degrees in molecule A and 29.6 (1)degrees in B. The cyclohexane rings adopt chair conformations. In the crystal packing, intermolecular N-H center dot center dot center dot O hydrogen bonds interconnect adjacent molecules into a ladder-like structure along the c axis incorporating R-2(2) (20) ring motifs. The crystal packing is further stabilized by weak intermolecular C-H center dot center dot center dot pi interactions.