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In the title compound, C 20 H 22 N 2 O 5 , a photo-degradation product of the hypertension drug nisoldipine, the dihedral angle between the nitro­sophenyl ring and the pyridine ring is 75.7 (3)°. In the crystal structure, weak C—H⋯O hydrogen bonds help to establish the packing.

5-Methyl 3-(2-methylprop-3-yl) 2,6-dimethyl-4-(2-nitrosophenyl)pyridine-3,5-dicarboxylate