Using CCO, CC(C)(C)N1C(=O)CC(c2ccc(C(Br)Br)cc2F)S1(=O)=O to produce CC(C)(C)N1C(=O)CC(c2ccc(C=O)cc2F)S1(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.