['CC', 'Cc1c([N+](=O)[O-])cccc1S(=O)(=O)NCC#N', 'CC#N', 'CCNS(=O)(=O)c1cccc([N+](=O)[O-])c1C', 'CCNCC#N', 'Cc1c([N+](=O)[O-])cccc1[SH](=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.