['CC', 'O=[N+]([O-])c1cc(S(=O)(=O)C(F)(F)F)ccc1N1CCCC(O)C1', 'CCO', 'O=[N+]([O-])c1cc(S(=O)(=O)C(F)(F)F)ccc1N1CCCCC1', 'CCOC1CCCNC1', 'O=[N+]([O-])c1cccc(S(=O)(=O)C(F)(F)F)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCCCC2)cc1.