['O=[SH](=O)C1CCCCC1', 'Cc1ccc([N+](=O)[O-])c(N)c1', 'NS(=O)(=O)C1CCCCC1', 'Cc1ccc([N+](=O)[O-])cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(Nc1ccccc1)C1CCCCC1.