The asymmetric unit of the title compound, C 25H 35NO 6, contains two independent molecules. In each molecule, the 1,4-dihydropyridine ring adopts a flattened boat conformation. The dihedral angles between the 1,4-dihydropyridine and benzene rings are 87.55 (7) and 87.23 (7)°. In one of these molecules, one of the isobutyl groups is disordered over two sets of sites, with an occupancy ratio of 0.890 (2):0.110 (2). In the crystal, molecules are linked through N - H⋯O, O - H⋯O and C - H⋯O hydrogen bonds forming two-dimensional networks parallel to the ab plane. The crystal structure is further stabilized by weak C - H⋯π interactions.