Using CCOC(=O)c1csc(Br)n1, OB(O)c1ccc(OC(F)(F)F)cc1 to produce CCOC(=O)c1csc(-c2ccc(OC(F)(F)F)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.