['NC1[C@H]2COC[C@@H]12', 'O=[SH](=O)C1COC1', 'C1OC[C@H]2C[C@@H]12', 'NS(=O)(=O)C1COC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(NC1[C@H]2COC[C@@H]12)C1COC1.