Using CC(Br)c1nc2sccn2c(=O)c1Br, [N-]=[N+]=[N-] to produce CC(N=[N+]=[N-])c1nc2sccn2c(=O)c1Br, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.