['O=[SH](=O)CC1CC1', 'CN1C[C@H]2CNC[C@H]2C1', 'C1CC1', 'CN1C[C@@H]2CN(S(C)(=O)=O)C[C@@H]2C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(CC1CC1)N1C[C@H]2CNC[C@H]2C1.