['CC(C)(C)O', 'O=CN1CCN[C@@H]2CS(=O)(=O)C[C@@H]21', 'CC(C)(C)OC=O', 'O=S1(=O)C[C@@H]2NCCN[C@@H]2C1', 'CC(C)C', 'O=C(O)N1CCN[C@@H]2CS(=O)(=O)C[C@@H]21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)C[C@@H]2NCCN[C@@H]2C1.