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Ethanesulfonic acid, 1,1,2,2-tetrafluoro-2-(1,1,2,2,2-pentafluoroethoxy)-, potassium salt (1:1) CAS 117205-07-9 PubChem CID 2782415
O=S(=O)([O-])C(F)(F)C(F)(F)OC(F)(F)C(F)(F)F.[K+] -
1,1,2,2-tetrafluoro-2-(perfluoroethoxy)ethane-1-sulfonic acid, potassium salt CAS 117205-07-9 PubChem CID 87945123
O=S(=O)(O)C(F)(F)C(F)(F)OC(F)(F)C(F)(F)F.[K]