['CC', 'Cc1ccc(S(=O)(=O)NCC#N)cc1[N+](=O)[O-]', 'CC#N', 'CCNS(=O)(=O)c1ccc(C)c([N+](=O)[O-])c1', 'CCNCC#N', 'Cc1ccc([SH](=O)=O)cc1[N+](=O)[O-]']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.