['CN', 'CS(=O)(=O)CCCNc1ccc(C=O)cc1[N+](=O)[O-]', 'CCCS(C)(=O)=O', 'CNC(=O)c1ccc(N)c([N+](=O)[O-])c1', 'CS(=O)(=O)CCCN', 'CNC(=O)c1cccc([N+](=O)[O-])c1', 'CNC=O', 'CS(=O)(=O)CCCNc1ccccc1[N+](=O)[O-]']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.