Using COS(=O)(=O)OC, O=C1NCN(c2cccc([N+](=O)[O-])c2)c2ncccc21 to produce CN1CN(c2cccc([N+](=O)[O-])c2)c2ncccc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.