2,4-Imidazolidinedione, 5-ethyl-5-(1-naphthalenyl)-, sodium salt 5,5-alpha-Naphthylethylhydantoin sodium salt 5-Ethyl-5-(1-naphthyl)hydantoin sodium salt Hydantoin, 5-ethyl-5-(1-naphthyl)-, sodium salt MU2370000