['CO', 'CCN(CC#N)S(=O)(=O)c1ccccc1', 'CC', 'COc1ccc(S(=O)(=O)NCC#N)cc1', 'CC#N', 'CCNS(=O)(=O)c1ccc(OC)cc1', 'CCNCC#N', 'COc1ccc([SH](=O)=O)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.