Using CCOC(=O)Cn1nc(CBr)c2cccnc21, [N-]=[N+]=[N-] to produce CCOC(=O)Cn1nc(N=[N+]=[N-])c2cccnc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.