Using CCOC(=O)CCCBr, O=C1N(c2cc(Cl)c(O)c(Cl)c2)C(=O)C2(Cc3ccc(Br)cc3)CCCN12 to produce CCOC(=O)CCCOc1c(Cl)cc(N2C(=O)N3CCCC3(Cc3ccc(Br)cc3)C2=O)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.