['CNC', 'CC(C)C(C=O)NCc1ccc(C#N)cc1', 'CC(C)CC(=O)N(C)C', 'N#Cc1ccc(CN)cc1', 'Cc1ccc(C#N)cc1', 'CC(C)C(N)C(=O)N(C)C', 'N#Cc1ccccc1', 'CNC(C(=O)N(C)C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.