['CC(C)C', 'O=S1(=O)c2cccc3cccc(c23)N1CCO', 'CC(C)(C)O', 'CCN1c2cccc3cccc(c23)S1(=O)=O', 'CCOC(C)(C)C', 'O=S1(=O)Nc2cccc3cccc1c23']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)Nc2cccc3cccc1c23.