['OC(F)F', 'Cc1ccc(C(=O)NNS(=O)(=O)c2cccc(Cl)c2)s1', 'Cc1cccs1', 'O=CNNS(=O)(=O)c1ccc(OC(F)F)c(Cl)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(NNS(=O)(=O)c1ccccc1)c1cccs1.