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The title compound, C 9 H 14 N 2 O, exists in the zwitterionic form in the crystal. The cyclo­octane ring adopts a twisted boat-chair conformation. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into sheets lying parallel to  bc . The structure is also stabilized by π–π inter­actions, with a centroid-to-centroid distance of 3.5684 (8) Å.

4,5,6,7,8,9-Hexahydro-2H-cycloocta[c]pyrazol-1-ium-3-olate