4-Pyridinecarboxylic acid, (1-(2-(4-oxo-2-thioxo-5-imidazolidinyl)ethyl)hexylidene)hydrazide 5-(3-Oxooctyl)-2-thiohydantoin isonicotinoylhydrazone Isonicotinic acid, (1-(2-(4-oxo-2-thioxo-5-imidazolidinyl)ethyl)hexylidene)hydrazide US5902000