Using CCCCBr, O=C1CN2Cc3cc(OCCCCCCn4ccnc4)ccc3N=C2N1 to produce CCCCN1C(=O)CN2Cc3cc(OCCCCCCn4ccnc4)ccc3N=C21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.