['CC(C)CNCC(F)(F)F', 'O=CNc1ccc([N+](=O)[O-])cc1Cl', 'Nc1ccc([N+](=O)[O-])cc1Cl', 'CC(C)CN(C=O)CC(F)(F)F', 'CC(C)C', 'O=C(NCC(F)(F)F)Nc1ccc([N+](=O)[O-])cc1Cl', 'CC(F)(F)F', 'CC(C)CNC(=O)Nc1ccc([N+](=O)[O-])cc1Cl', 'O=[N+]([O-])c1cccc(Cl)c1', 'CC(C)CN(CC(F)(F)F)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.