Using O=C(O)C(=O)O, CNc1ccc([N+](=O)[O-])cc1N to produce Cn1c(=O)c(=O)[nH]c2cc([N+](=O)[O-])ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.