title: N,N'-Bis(4-nitro-phen-yl)biphenyl-2,2'-dicarboxamide.
abstract: In the title compound, C(26)H(18)N(4)O(6), the amide units are approximately coplanar with the benzene ring bonded to the N atom [dihedral angles of 10.59 (10) and 24.00 (12)°], but twisted significantly out of the plane of the benzene ring bonded to the carbonyl C atom [dihedral angles of 57.82 (9) and 58.05 (9)°]. The dihedral angle between the two rings of the biphenyl unit is 77.66 (4)°. Intra-molecular N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions occur. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds and C-H⋯O contacts.
authors.affiliation: School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, People's Republic of China.
authors.forename: Gui-Yu
authors.initials: GY
authors.lastname: Wang
authors.forename: Da-Bin
authors.initials: DB
authors.lastname: Qin
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Guo
authors.forename: Jie-Wei
authors.initials: JW
authors.lastname: Luo