['Cc1ccc(Cl)cc1N', 'CC(C)(C)C(=O)NCCCC=O', 'CC(C)(C)C=O', 'Cc1ccc(Cl)cc1NC(=O)CCCN', 'CC(C)(C)C(N)=O', 'CCCC(=O)Nc1cc(Cl)ccc1C', 'Cc1ccc(Cl)cc1', 'CC(C)(C)C(=O)NCCCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.