Using CCOC(=O)CBr, CN1C(=O)N(c2ccc(Cl)cc2)S(=O)(=O)c2ccc(O)cc21 to produce CN1C(=O)N(c2ccc(Cl)cc2)S(=O)(=O)c2ccc(OCC(=O)O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.