['Cc1ccc([SH](=O)=O)cc1', 'O=C(O)C[C@@H]1NCCNC1=O', 'CC(=O)O', 'Cc1ccc(S(=O)(=O)N2CCNC(=O)C2)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CN(S(=O)(=O)c2ccccc2)CCN1.