Using [Br-], CC(=O)c1ccc(OCCNC(=O)OCc2ccccc2)cc1 to produce O=C(NCCOc1ccc(C(=O)CBr)cc1)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.