4-Pyridinecarboxylic acid, (1-((4-oxo-2-thioxo-5-imidazolidinyl)methyl)heptylidene)hydrazide 5-(2-Oxooctyl)-2-thiohydantoin isonicotinoylhydrazone Isonicotinic acid, (1-((4-oxo-2-thioxo-5-imidazolidinyl)methyl)heptylidene)hydrazide US5902200