21720-43-4 5,5-Diphenyl-3-((4-methyl-1-piperazinyl)methyl)-2-thiohydantoin 5-24-08-00404 (Beilstein Handbook Reference) BRN 0711263 Hydantoin, 5,5-diphenyl-3-((4-methyl-1-piperazinyl)methyl)-2-thio-