5,5-Diphenyl-2,4-imidazolidinedione 5,5-Diphenylhydantoin 57-41-0 630-93-3 (SODIUM SALT) AIDS-000219 AIDS000219 Aleviatin DPH Dilantin Diphenylhydantoin Hidantal Lepitoin NSC8722 PHT Phenytoine Sodanton Zentropil