1,4-dibromo-1,1,2,2-tetrafluorobutane 18599-20-7, Information for 1,4-dibromo-1,1,2,2-tetrafluorobutane 18599-20-7, Suppliers of 1,4-dibromo-1,1,2,2-tetrafluorobutane 18599-20-7