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2-Benzoylpyridine piperidinyl- and hexamethyleneiminylthiosemicarbazones, HBzpip and HBzhexim, respectively, crystallize in a hydrogen bonded  Z  isomeric conformation with respect to the C7–N2 bond. The intramolecular hydrogen bond is between N3–H…N1, but the S atom is  E  to the azomethine nitrogen, N2, for HBzpip and  Z  for HBzhexim. HBzpip is the second  ZE  isomer known, but the first that does not have a formal hydrogen bond to N2.

Different structures for two very similar 2-benzoylpyridine azacyclothiosemicarbazones