3-Phenyl-5-beta-carboxyethyl-2-thioguidantoin 4-IMIDAZOLIDINEPROPIONIC ACID, 5-OXO-1-PHENYL-2-THIOXO- 5-Oxo-1-phenyl-2-thioxo-4-imidazolidinepropionic acid 5-Oxo-1-phenyl-2-thioxoimidazolidine-4-propionic acid 5624-27-1 EINECS 227-056-0 Glutamic acid phenylthiohydantoin Glutamic phenylthiohydantoin