['CNCC(C)C#N', 'CN(C)c1ccc([N+](=O)[O-])cc1C=O', 'CC(C)C#N', 'CNC(=O)c1cc([N+](=O)[O-])ccc1N(C)C', 'CNC', 'CC(C#N)CN(C)C(=O)c1cccc([N+](=O)[O-])c1', 'CC(C#N)CN(C)C=O', 'CN(C)c1ccc([N+](=O)[O-])cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.