['CC', 'Cc1ccc(C)c(S(=O)(=O)NCC#N)c1', 'CC#N', 'CCNS(=O)(=O)c1cc(C)ccc1C', 'CCNCC#N', 'Cc1ccc(C)c([SH](=O)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.