(±)-p-HPPH

5-(4-HYDROXYPHENYL)-5-PHENYLHYDANTOIN

rac-(5R*)-5-(4-Hydroxyphenyl)-5-phenylimidazolidine-2,4-dione

(±)-5-(4-Hydroxyphenyl)-5-phenyl-1H-imidazole-2,4(3H,5H)-dione