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The title compound, C4H6N2O, displays two predominant hydrogen-bonding inter­actions in the crystal structure. The first is between the unprotonated imidazole N atom of one mol­ecule and the hy­droxy H atom of an adjacent mol­ecule. The second is between the hy­droxy O atom of one mol­ecule and the imidazole N—H group of a corresponding mol­ecule. These inter­actions lead to the formation of a two-dimnensional network parallel to (10-1). C—H⋯O inter­actions also occur.

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A Parham Cyclization Approach to Diaryl-Fused Seven-Membered Ring Heterocyclic Ketones. -The novel synthesis of the title compounds involves the generation of functionalized aryllithiums from aryl bromides followed by intramolecular cyclization onto an electrophilic nitrile functional group. -(FARROKH, J.; CAMPOS, C.; HUNT*, D. A.; Tetrahedron Lett. 56 (2015) 37, 5245-5247, http://dx.