['CC', 'N#CCNS(=O)(=O)c1cccc(C#N)c1', 'CC#N', 'CCNS(=O)(=O)c1cccc(C#N)c1', 'CCNCC#N', 'N#Cc1cccc([SH](=O)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.