Using O=C1CN=C(c2ccccc2)c2cc(Cl)ccc2N1, COC(CBr)OC to produce COC(CN1C(=O)CN=C(c2ccccc2)c2cc(Cl)ccc21)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.