Using O=[N+]([O-])O, Cc1nc(N)ccc1CN1C(=O)c2ccccc2C1=O to produce Cc1nc(N)c([N+](=O)[O-])cc1CN1C(=O)c2ccccc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.