Using O=C(O)CCC(=O)CNC(=O)OCc1ccccc1, CC(Br)C(=O)OCc1ccccc1 to produce CC(OC(=O)CCC(=O)CNC(=O)OCc1ccccc1)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.