1-Carboxymethyl-3-phenyl-2-thiohydantoin 1-Imidazolidineacetic acid, 4-oxo-3-phenyl-2-thioxo- 4-Oxo-3-phenyl-2-thioxo-1-imidazolidineacetic acid 4-Oxo-3-phenyl-2-thioxoimidazolidine-1-acetic acid 62609-86-3 EINECS 263-633-3 NSC 270707