Using CN1Cc2c(Cl)cc(Cl)cc2C(c2cccc(NC(=O)Oc3ccc([N+](=O)[O-])cc3)c2)C1, NCCO to produce CN1Cc2c(Cl)cc(Cl)cc2C(c2cccc(NC(=O)NCCO)c2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.