['C[SH](=O)=O', 'Cc1cn2nc(N3CCC(N)CC3)sc2n1', 'Cc1cn2ncsc2n1', 'CS(=O)(=O)NC1CCNCC1', 'CS(N)(=O)=O', 'Cc1cn2nc(N3CCCCC3)sc2n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn2nc(N3CCCCC3)sc2n1.