['CCC', 'N#CCNCc1ccc([N+](=O)[O-])cc1', 'CC#N', 'CC(C)NCc1ccc([N+](=O)[O-])cc1', 'CC(C)NCC#N', 'Cc1ccc([N+](=O)[O-])cc1', 'CC(C)N(C)CC#N', 'O=[N+]([O-])c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.