Using O=C1c2ccc([N+](=O)[O-])cc2C(=O)c2c1cccc2[N+](=O)[O-] to produce Nc1cccc2c1C(=O)c1cc([N+](=O)[O-])ccc1C2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.