Synonyms: FX-4; NONAFLUOROBUTANESULFONYL FLUORIDE; NONAFLUOROBUTANESULPHONYL FLUORIDE; NONAFLUORO-1-BUTANESULFONYL FLUORIDE; PERFLUOROBUTANESULFONYL FLUORIDE; PERFLUORO-1-BUTANESULFONYL FLUORIDE; PERFLUOROBUTYL SULFONYL FLUORIDE; PERFLUOROBUTANESULPHONYL FLUORIDE; 1,1,2,2,3,3,4,4,4-nonafluoro-1-butanesulfonylfluorid; 1,1,2,2,3,3,4,4,4-Nonafluoro-1-butanesulfonylfluoride; 1-Butanesulfonyl fluoride, 1,1,2,2,3,3,4,4,4-nonafluoro-; 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulphonyl fluoride; Perfluorobutansulfonylfluoride; Nonaflylfluoride; Perfluorobutansulfonylfluoride-RM60; Perfluorobutanesalfonylfluoride