O=S(=O)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F
Name: perfluorobutansulfonyl fluoride
SMILES: O=S(=O)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F
Molecular formula: C4F10O2S
Molecular weight: 301.95
Fetching from PubChem (queue #8)