['FC(F)CC1COCCN1', 'O=[SH](=O)c1cccc2c1OCCO2', 'CC(F)F', 'O=S(=O)(c1cccc2c1OCCO2)N1CCOCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cccc2c1OCCO2)N1CCOCC1.