N-methyl-N-isonicotinoyl-N'-4-nitrobenzylidenehydrazine, and the unstable N-methy1-N'- veratrylidenehydrazine afforded the veratrylidene analogue. Attempted condensation of isonicotinoyl chloride and N-cydohexylidene-N'-methylhydrazine (Todd, J. Amer. Chem.