['CO', 'CC(C=O)CN(C)C(=O)c1ccc(S(C)(=O)=O)cc1', 'CNCC(C)C(=O)OC', 'CS(=O)(=O)c1ccc(C=O)cc1', 'COC(=O)C(C)C', 'CNC(=O)c1ccc(S(C)(=O)=O)cc1', 'CS(=O)(=O)c1ccccc1', 'COC(=O)C(C)CN(C)C=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.