Catalyzes the stereospecific hydrolysis of the cyclic amide bond of D-hydantoin derivatives with an aromatic side chains at the 5'-position. Has no activity on dihydropyrimidines. The physiological function is unknown. D-5-phenylhydantoin + H2O = H(+) + N-carbamoyl-D-phenylglycine Binds 2 divalent metal cations per subunit. Can use zinc, nickel, cobalt or manganese. Hydantoin derivatives with an aliphatic or no side chain at their 5'-position results in a much lower level of activity than those with aromatic side chains at the 5'-position. Optimum pH is 8-8.5. Optimum temperature is 45-50 degrees Celsius. Homotetramer. Carboxylation allows a single lysine to coordinate two divalent metal cations. Belongs to the metallo-dependent hydrolases superfamily. Hydantoinase/dihydropyrimidinase family. Extended N-terminus.