['CC(C)(C)C=O', 'CCN(C)Cc1cccc(CN)c1', 'CC', 'CNCc1cccc(CNC(=O)C(C)(C)C)c1', 'CCNC', 'Cc1cccc(CNC(=O)C(C)(C)C)c1', 'CC(C)(C)C(N)=O', 'CCN(C)Cc1cccc(C)c1', 'CCN(C)C', 'CC(C)(C)C(=O)NCc1ccccc1', 'CNC(=O)C(C)(C)C', 'CCN(C)Cc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.