Using CCCCc1nc2cc(Br)cc(C(=O)O)c2n1Cc1ccccc1Cl, ClC(Cl)Cl to produce CCCCc1nc2cc(Br)cc(C(=O)OC)c2n1Cc1ccccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.