['O=[SH](=O)C1CC1', 'O=S(=O)(N[C@@H]1CCCNC1)N1CCOCC1', 'NS(=O)(=O)N1CCOCC1', 'O=S(=O)(C1CC1)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(N[C@@H]1CCCN(S(=O)(=O)C2CC2)C1)N1CCOCC1.