5-(4-Hydroxyphenyl)-5-phenylhydantoin, p-hydroxyphenytoin, 4-Hydroxydiphenylhydantoin p-Hydroxyphenytoin, hydroxydiphenylhydantoin, 5-p-hydroxyphenyl-5-phenylhydantoin, p-hydroxydiphenylhydantoin, 5--5-phenyl-d5-hydantoin-13C3, 4-hydroxydiphenylhydantoin, para-hydroxyphenytoin, 4'-Hydroxyphenytoin, hydroxyphenytoin