['CC(CN)CO', 'CC(C)c1ccc(NC(=O)C=O)cc1', 'CC(CO)CNC(=O)C=O', 'CC(C)c1ccc(N)cc1', 'CC(C)CO', 'CC(C)c1ccc(NC(=O)C(N)=O)cc1', 'CC(C)c1ccccc1', 'CC(CO)CNC(=O)C(N)=O', 'CCC', 'CC(CO)CNC(=O)C(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.