title: 9-(2-Chloro-benz-yloxy)-6,7-dihydro-2H-benzo[c][1,2,4]triazolo[4,3-a]azepin-3(5H)-one.
abstract: In the title mol-ecule, C(18)H(16)ClN(3)O(2), the seven-membered ring adopts an envelope conformation with the flap atom deviating by 0.801 (5) Å from the mean plane formed by the remaining non-H atoms. Inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers. The crystal packing also exhibits weak inter-molecular C-H⋯N hydrogen bonds and π-π inter-actions with a short distance of 3.734 (3) Å between the centroids of the aromatic rings of neighbouring mol-ecules.
authors.forename: Da-Cheng
authors.initials: DC
authors.lastname: Jin
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Zhang
authors.forename: Feng-Yu
authors.initials: FY
authors.lastname: Piao
authors.forename: Rong-Bi
authors.initials: RB
authors.lastname: Han