Using CCN1CCN(c2nc(C)nc3[nH]c(-c4ccccc4Cl)nc23)CC1, COCBr to produce CCN1CCN(c2nc(C)nc3c2nc(-c2ccccc2Cl)n3COC)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.