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