['C[C@H]1CNCCN1S(C)(=O)=O', 'O=[SH](=O)c1c[nH]c2cccc(F)c12', 'C[SH](=O)=O', 'C[C@H]1CN(S(=O)(=O)c2c[nH]c3cccc(F)c23)CCN1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1c[nH]c2ccccc12)N1CCNCC1.