(3-pyridyl)methylidenehydrazide of benzilic acid
α-(pyridyl)benzylhydrazide of benzilic acid
Hydroxy-diphenyl-acetic acid N'-(1-pyridin-3-yl-propyl)-hydrazide
α-(3-pyridyl)ethylhydrazide of benzilic acid
Benzoic acid N'-[2,2-bis-(4-chloro-phenyl)-2-hydroxy-acetyl]-N-ethyl-hydrazide