Using CCCCOc1nc(N)c2nc(OC)[nH]c2n1, COC(=O)c1ccccc1OCCBr to produce CCCCOc1nc(N)c2nc(OC)n(CCOc3ccccc3C(=O)OC)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.