['CO', 'CC(C)C(=O)Nc1cc(C=O)ccc1F', 'CC(C)C=O', 'COC(=O)c1ccc(F)c(N)c1', 'CC(C)C(N)=O', 'COC(=O)c1ccc(F)cc1', 'COC=O', 'CC(C)C(=O)Nc1ccccc1F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.