Using NCCOCCO, CN(CCn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)O)ccc21)C(=O)OC(C)(C)C to produce CN(CCn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)NCCOCCO)ccc21)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.