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The title compound, C 12 H 18 N 2 O, was synthesized by the reaction of cyclo­hexa­none and 2-amino­cyclo­pent-1-enecarbonitrile. In the mol­ecule of the title compound, the six-carbon ring displays a chair conformation, the six-membered 1,3-diaza ring and the cyclo­pentene ring both assume envelope conformations. Supra­molecular aggregation is achieved by N—H⋯O hydrogen bonds.

Cyclohexanespiro-2′-[2′,3′,6′,7′-tetrahydro-1′H-cyclopenta[d]pyrimidin]-4′(5′H)-one