Using O=[N+]([O-])[O-], O=C1Nc2ccc(Cl)c(Cl)c2C1=O to produce O=C1Nc2c([N+](=O)[O-])cc(Cl)c(Cl)c2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.