['CC(C)CCC=O', 'COc1ccc(N)cc1NC(C)=O', 'CC=O', 'COc1ccc(NC(=O)CCC(C)C)cc1N', 'CO', 'CC(=O)Nc1cccc(NC(=O)CCC(C)C)c1', 'CC(C)CCC(N)=O', 'COc1ccccc1NC(C)=O', 'CC(N)=O', 'COc1ccc(NC(=O)CCC(C)C)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.