['CS(N)(=O)=O', 'CCCSc1nc(C)cc(N)n1', 'CCCNS(C)(=O)=O', 'Cc1cc(N)nc(S)n1', 'C[SH](=O)=O', 'Cc1cc(N)nc(SCCCN)n1', 'Cc1cc(N)ncn1', 'CS(=O)(=O)NCCCS']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cncnc1.