title: 2-(2-Chloro-pyrimidin-4-yl)-3,5,6,7,8,9-hexahydro-2H-1,2,4-triazolo[4,3-a]azepin-3-one.
abstract: In the title compound, C(11)H(12)ClN(5)O, the triazolone and pyrimidine rings are almost coplanar [dihedral angle = 2.98 (14)°]. The total puckering amplitude Q(T) of the seven-membered lactam ring is 0.706 (3) Å.
authors.forename: Gong-Chun
authors.initials: GC
authors.lastname: Li
authors.forename: Li-Ye
authors.initials: LY
authors.lastname: Wang
authors.forename: Zhao-Yang
authors.initials: ZY
authors.lastname: Li
authors.forename: Feng-Ling
authors.initials: FL
authors.lastname: Yang