(R)-1-METHYLMEPHENYTOIN

(R)-5-Ethyl-1,3-diMethyl-5-phenyl-

[(R)-1,3-DIMETHYL-5-ETHYL-5-PHENYLHYDANTOIN]

(R)-5-Ethyl-1,3-dimethyl-5-phenyl-2,4-imidazolidinedione