Using CCOC(=O)c1cn(C)c2c(CBr)csc2c1=O, [N-]=[N+]=[N-] to produce CCOC(=O)c1cn(C)c2c(CN=[N+]=[N-])csc2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.