Using CCCn1c(COC)nc2c(N)nc3ccc(O)cc3c21, O=C(CBr)N1CCOCC1 to produce CCCn1c(COC)nc2c(N)nc3ccc(OCC(=O)N4CCOCC4)cc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.