Leucine 3-phenyl-2-thiohydantoin, PTH-DL-Leucine Phenylthiohydantoin-DL-leucine, 5-isobutyl-3-phenyl-2-thioxo-imidazolidin-4-one, 5-ISOBUTYL-3-PHENYL-2-THIOHYDANTOIN, 5-Isobutyl-3-phenyl-thiohydantoin, PTH-DL-LEUCINE, 1-Phenyl-2-thioxo-4-isobutylimidazolidine-5-one, 5-Isobutyl-3-phenyl-2-thioxo-4-imidazolidinone, 5-Isobutyl-3-phenyl-2-thioxo-imidazolidin-4-on, PTH-L-LEUCINE, DL-methionine methyl ester hydrochloride, D,L-leucine N-phenylthiohydantoin, methionine methyl ester hydrochloride, D,L-methionine methyl ester hyfrochloride, H-DL-Met-OMe.HCl, PHENYLTHIOHYDANTOIN-LEUCINE, 3-Phenyl-5-isobutyl-thiohydantoin, 2-Thioxo-3-phenyl-5-isobutylimidazolidine-4-one