['Cn1nncc1[SH](=O)=O', 'O=C1CNCCN1CC(F)(F)F', 'CC(F)(F)F', 'Cn1nncc1S(=O)(=O)N1CCNC(=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CN(S(=O)(=O)c2cnn[nH]2)CCN1.