['CC[SH](=O)=O', 'OCC1CNCCC1C(F)(F)F', 'FC(F)F', 'CCS(=O)(=O)N1CCCC(CO)C1', 'CO', 'CCS(=O)(=O)N1CCC(C(F)(F)F)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.