Using CCOC(=O)C(=O)O, Nc1cc([N+](=O)[O-])ccc1NCCC(=O)O to produce O=C(O)CCn1c(=O)c(=O)[nH]c2cc([N+](=O)[O-])ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.