title: 2-Methyl-2,4-di-4-pyridyl-2,3-dihydro-1H-1,5-benzodiazepine acetic acid solvate.
abstract: In the title compound, C(20)H(18)N(4)·CH(3)COOH, the benzene ring forms dihedral angles of 81.34 (11) and 54.32 (11)° with the two pyridine rings. In the crystal, inter-molecular O-H⋯N hydrogen bonding links one 1,5-benzodiazepine mol-ecule and one acetic acid solvent mol-ecule into a dimer. These dimers, related by translation along the b axis, are further linked into chains via weak inter-molecular N-H⋯N hydrogen bonds.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, Jilin University, 2699 Qianjin Avenue, Changchun 130012, People's Republic of China.
authors.forename: Shi-Chao
authors.initials: SC
authors.lastname: Wang
authors.forename: Qiu-Fei
authors.initials: QF
authors.lastname: Hou
authors.forename: Shi-Mei
authors.initials: SM
authors.lastname: Jiang