['C[SH](=O)=O', 'NC12CCC(C(F)(F)F)(CC1)CC2', 'CS(N)(=O)=O', 'FC(F)(F)C12CCC(CC1)CC2', 'FC(F)F', 'CS(=O)(=O)NC12CCC(CC1)CC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC2CCC1CC2.