['CCCS(C)(=O)=O', 'Cc1cc(N)n2nc(C(F)(F)F)nc2n1', 'CS(=O)(=O)CCCN', 'Cc1ccn2nc(C(F)(F)F)nc2n1', 'FC(F)F', 'Cc1cc(NCCCS(C)(=O)=O)n2ncnc2n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnc2ncnn2c1.