['Cc1ccccc1', 'O=S1(=O)C[C@@H]2NCCN[C@@H]2C1', 'c1ccccc1', 'CN1CCN[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(Cc3ccccc3)[C@@H]2C1.