title: 5-Methyl 3-(2-methyl-prop-3-yl) 2,6-di-methyl-4-(2-nitro-sophen-yl)pyridine-3,5-dicarboxyl-ate.
abstract: 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 nitro-sophenyl ring and the pyridine ring is 75.7 (3)°. In the crystal structure, weak C-H⋯O hydrogen bonds help to establish the packing.
authors.affiliation: School of Pharmacy, Fourth Military Medical University, Changle West Road 17, 710032 Xi-An, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Ding
authors.initials: D
authors.lastname: Qu
authors.forename: Qiao-Feng
authors.initials: QF
authors.lastname: Wang
authors.forename: Ru
authors.initials: R
authors.lastname: Jiang