2218-54-4 375-22-4 3794-64-7 4-02-00-00810 (Beilstein Handbook Reference) BRN 1426882 BUTYRIC ACID, HEPTAFLUORO- Butanoic acid, heptafluoro- EINECS 206-786-3 Heptafluoro-1-butanoic acid Heptafluorobutanoic acid Heptafluorobutyric acid Kyselina heptafluormaselna [Czech] NSC 820 Perfluorobutanoic acid Perfluorobutyric acid Perfluoropropanecarboxylic acid