Octafluorobutan-1-one, Heptafluorobutanoyl chloride, Heptafluorobutanoyl fluoride, Heptafluorobutyryl fluoride, 2,2,3,3,4,4,4-heptafluorobutyryl fluoride, Butanoyl fluoride,heptafluoro, n-perfluorobutyryl fluoride, Perfluorobutyryl fluoride, Perfluorobutyric acid fluoride, perfluoroisobutyryl fluoride