['CCCN', 'CS(=O)(=O)c1cc(C(=O)NCCC=O)cc([N+](=O)[O-])c1', 'CCCNC(=O)CCN', 'CS(=O)(=O)c1cc(C=O)cc([N+](=O)[O-])c1', 'CCC', 'CS(=O)(=O)c1cc(C(=O)NCCC(N)=O)cc([N+](=O)[O-])c1', 'CCCNC(=O)CC', 'CS(=O)(=O)c1cc(C(N)=O)cc([N+](=O)[O-])c1', 'CCCNC(=O)CCNC=O', 'CS(=O)(=O)c1cccc([N+](=O)[O-])c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.