['CC(C)CN', 'CC(C)[C@@H](C=O)NC(=O)c1ccc([N+](=O)[O-])cc1Cl', 'O=Cc1ccc([N+](=O)[O-])cc1Cl', 'CC(C)CNC(=O)[C@@H](N)C(C)C', 'CC(C)C', 'CC(C)[C@H](NC(=O)c1ccc([N+](=O)[O-])cc1Cl)C(N)=O', 'CC(C)CNC(=O)CC(C)C', 'NC(=O)c1ccc([N+](=O)[O-])cc1Cl', 'O=[N+]([O-])c1cccc(Cl)c1', 'CC(C)CNC(=O)[C@@H](NC=O)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.