['N#CCCNCCC#N', 'O=CCOc1ccc([N+](=O)[O-])cc1C(F)(F)F', 'CC(=O)N(CCC#N)CCC#N', 'O=[N+]([O-])c1ccc(O)c(C(F)(F)F)c1', 'N#CCCN(CCC#N)C(=O)CO', 'O=[N+]([O-])c1cccc(C(F)(F)F)c1', 'CCC#N', 'N#CCCNC(=O)COc1ccc([N+](=O)[O-])cc1C(F)(F)F', 'FC(F)F', 'N#CCCN(CCC#N)C(=O)COc1ccc([N+](=O)[O-])cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.