['N#Cc1ccccc1N', 'CC(N(C)CCC=O)C(C)(C)C', 'CCC(C)(C)C', 'CNCCC(=O)Nc1ccccc1C#N', 'CNC(C)C(C)(C)C', 'CCC(=O)Nc1ccccc1C#N', 'N#Cc1ccccc1', 'CC(N(C)CCC(N)=O)C(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.