['CNCCC(C)C', 'CCCc1ccc(C=O)cc1', 'CCC(C)C', 'CCCc1ccc(C(=O)NC)cc1', 'CC(C)CCN(C)C=O', 'CCCc1ccccc1', 'CCC', 'CC(C)CCN(C)C(=O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.