(Methylsulfonyl)methanesulfonic acid 2-fluoroethyl ester 2-Fluoroethyl (methylsulfonyl)methanesulfonate 2-Fluoroethyl SOSO 88343-73-1 BRN 5932631 Methanesulfonic acid, (methylsulfonyl)-, 2-fluoroethyl ester NSC 354446