['CC', 'CON(c1nc(N)nc(Cl)n1)S(=O)(=O)c1ccc(C)cc1', 'CCN', 'CON(c1ncnc(Cl)n1)S(=O)(=O)c1ccc(C)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(Nc1ncncn1)c1ccccc1.