['CC12CCNCC1C2(F)F', 'CCn1nc(C)c([SH](=O)=O)c1C', 'CC', 'Cc1n[nH]c(C)c1S(=O)(=O)N1CCC2(C)C(C1)C2(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cn[nH]c1)N1CCC2CC2C1.