1-Isonicotinoyl-2-veratrylidenehydrazine 3,4-Dimethoxybenzal isonicotinoylhydrazone 4-Pyridinecarboxylic acid, [(3,4-dimethoxyphenyl)methylene]hydrazide 93-47-0 Isonicotinic acid, veratrylidenehydrazide N'-Veratrylideneisoniazid NSC180261 Nicotazide Veratraldehyde isonicotinoylhydrazone Verazide Verazina