Bis(4-fluorophenyl) sulfone4,4'-DIFLUORODIPHENYL SULFONEBis(4-fluorophenyl) sulfone双(4-氟苯基)砜4,4′-二氟二苯砜4-Fluorophenyl sulfone4-氟苯基砜4,4′-Difluorodiphenyl sulfone1,1'-Sulphonylbis(4-fluorobenzene), Bis(4-fluorophenyl) sulphone4,4'-Difluorodiphenyl sulphone 98%4,4'-Sulfonylbis(fluorobenzene)4,4'-Difluorodiphenyl sulfone