Using Oc1ccc2c(-c3c(-c4ccccn4)nn4ccccc34)ccnc2c1, ClCCBr to produce ClCCOc1ccc2c(-c3c(-c4ccccn4)nn4ccccc34)ccnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.