['Cn1ccc(N)n1', 'CS(=O)(=O)c1ccc(Cl)c([SH](=O)=O)c1', 'Cn1cccn1', 'CS(=O)(=O)c1ccc(Cl)c(S(N)(=O)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(Nc1cc[nH]n1)c1ccccc1.