Using CCOC(=O)CCCn1cc(C(=O)c2ccc(N)c(O)c2)c2ccccc21, CCC(Cl)Br to produce CCOC(=O)CCCn1cc(C(=O)c2ccc(N)c(OCCCCl)c2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.