Using O=C([O-])C(F)(F)F, CCOC(=O)c1csc2cc(OC)c(Br)cc12 to produce CCOC(=O)c1csc2cc(OC)c(C(F)(F)F)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.