['Cn1nccc1S(N)(=O)=O', 'CC(C)[C@@H]1C[C@@H](C)c2ccccc21', 'Cn1nccc1[SH](=O)=O', 'CC(C)[C@@H]1C[C@@H](CN)c2ccccc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(NC[C@@H]1CCc2ccccc21)c1ccn[nH]1.