Using CSc1nc2ccc(Br)cc2c(=O)[nH]1, O=[N+]([O-])c1nc[nH]n1 to produce CSc1nc(-n2cnc([N+](=O)[O-])n2)c2cc(Br)ccc2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.