Cyclo­pentanone 4-nitro­phenyl­hydrazone

The title compound, C₁₁H₁₃N₃O₂, includes a planar phenyl­hydrazone moiety and a five-membered carbon ring in an envelope conformation. A short C—C bond distance of 1.435 (6) Å is observed in the five-membered ring. This may be due to the larger displacement parameters of relevant atoms. Neighboring mol­ecules are linked to each other via hydrogen bonding, forming a zigzag supramolecular chain along the b axis.