Using O=[N+]([O-])[O-], O=CNC1Cc2cc(Br)ccc2N(C=O)C1 to produce O=CNC1Cc2cc(Br)cc([N+](=O)[O-])c2N(C=O)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.