Using CC(C)(C)OC(=O)NC(CO)(c1cc(Br)ccc1F)C(F)F, CC(Cl)C(=O)Cl to produce CC(Cl)C(=O)NC(CO)(c1cc(Br)ccc1F)C(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.