['C1CC(NC2CCC2)C1', 'O=[SH](=O)c1cnc2n1CCC2', 'C1CCC1', 'O=S(=O)(NC1CCC1)c1cnc2n1CCC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cnc2n1CCC2)N(C1CCC1)C1CCC1.