['O=C1CNCN1CC(F)(F)F', 'O=[SH](=O)c1ccc2ncsc2c1', 'CC(F)(F)F', 'O=C1CN(S(=O)(=O)c2ccc3ncsc3c2)CN1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CN(S(=O)(=O)c2ccc3ncsc3c2)CN1.