['CCCCOCCCN', 'CS(=O)(=O)c1cc(C=O)cc([N+](=O)[O-])c1', 'CCCC', 'CS(=O)(=O)c1cc(C(=O)NCCCO)cc([N+](=O)[O-])c1', 'CCCCO', 'CCCNC(=O)c1cc([N+](=O)[O-])cc(S(C)(=O)=O)c1', 'CCCCOCCC', 'CS(=O)(=O)c1cc(C(N)=O)cc([N+](=O)[O-])c1', 'CCCCOCCCNC=O', 'CS(=O)(=O)c1cccc([N+](=O)[O-])c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.