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The asymmetric unit of the title compound, C 9 H 11 ClN 4 , contains two virtually planar mol­ecules that differ in conformation about the bond connecting the hydrazine and pyridazine units. The 3-chloro-6-hydrazinylpyridazine and cyclo­pentane groups are oriented at dihedral angles of 4.5 (3) and 8.8 (4)° in the two mol­ecules. In the crystal, the mol­ecules form a one dimensional polymeric structure extending along the  a  axis  via  N—H⋯N hydrogen bonds. The crystal stucired was an inversion twin [ratio of the twin domains = 0.73 (9):0.27 (9)].

3-Chloro-6-[2-(cyclopentylidene)hydrazin-1-yl]pyridazine