Using Cc1nc2c(OCc3c(Cl)cc(C(=O)c4ccccc4)cc3Cl)cccn2c1Br to produce Cc1nc2c(OCc3c(Cl)cc(C(O)c4ccccc4)cc3Cl)cccn2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.