2-Thio-5-isobutyl-3-phenylhydantoin 4-Imidazolidinone, 5-(2-methylpropyl)-3-phenyl-2-thioxo- 4399-40-0 Hydantoin, 5-isobutyl-3-phenyl-2-thio- Leucine 3-phenyl-2-thiohydantoin Leucine, 3-phenyl-2-thiohydantoin NSC96424