7789-21-1 EINECS 232-149-4 FLUOSULFONIC ACID Fluorosulfonic acid Fluorosulfonic acid [UN1777] [Corrosive] Fluorosulfuric acid Fluorosulfuric acid (HSO3F) Fluorosulphuric acid Fluosulfuric acid HSDB 467 Monofluorosulfuric acid UN1777