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