Using O=[N+]([O-])[O-], COc1ccc(Br)c2c1CCC(=O)CC2 to produce COc1c([N+](=O)[O-])cc(Br)c2c1CCC(=O)CC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.