Acta Cryst. (2008). E64, o2453 [ doi:10.1107/S1600536808038877 ]
Abstract: In the title Schiff base, C18H22N4O, the hexahydropyrimidinyl ring adopts a chair conformation. The dihedral angle between the aromatic rings of the 4-(2-phenyldiazenyl)phenol unit is 15.7 (1)°. There is an intramolecular O-HN hydrogen bond between the hydroxyl group and an N atom of the hexahydropyimidinyl unit. Intermolecular N-HO and N-HN hydrogen bonds give rise to a layer structure.
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