['CS(N)(=O)=O', 'CCCSc1ncnc2ccsc12', 'CCCNS(C)(=O)=O', 'Sc1ncnc2ccsc12', 'C[SH](=O)=O', 'NCCCSc1ncnc2ccsc12', 'CS(=O)(=O)NCCCS', 'c1ncc2sccc2n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ncc2sccc2n1.