Using CCOC(=O)C(=O)CBr, N=C(NCc1ccccc1Cl)c1ccc(Br)cc1 to produce CCOC(=O)c1cn(Cc2ccccc2Cl)c(-c2ccc(Br)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.