Using O=C(Cl)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1Cl, NCCO to produce O=C(NCCO)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.