?1,3-Dibromo-5,5-dimethylhydantoin? , its cas register number is 77-48-5. It also can be called Dibromantin ; Dibromo-5,5-dimethylhydantoin ; 1,3-Dibromo-5,5-dimethyl-2,4-imidazolidinedione ; DBNPA .It is a?white powder.