Using COC(=O)c1cc(O)cc(O)c1, O=C(CBr)OCc1ccccc1 to produce COC(=O)c1cc(O)cc(OCC(=O)OCc2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.