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The title compound, C12H16N2O, is a diazepane intermediate that can be used as an inhibitor of human nitric oxide synthesis. In the molecule, the seven-membered ring has a chair-like conformation and the two rings are approximately perpendicular to one another, with a C—N—C—C torsion angle of 77.8 (4)°. Intermolecular N—H...O hydrogen bonds link the molecules into dimers around a centre of symmetry, with C—H...O interactions linking the dimers into infinite sheets.