Using Cc1cc2c(c3c1NC(=O)CC3(C)C)OC(CN=[N+]=[N-])C2 to produce Cc1cc2c(c3c1NC(=O)CC3(C)C)OC(CN)C2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.