['CC(C)(C)C(=O)NCC=O', 'COc1ccc(CN)cc1', 'CC(C)(C)C=O', 'COc1ccc(CNC(=O)CN)cc1', 'CO', 'CC(C)(C)C(=O)NCC(=O)NCc1ccccc1', 'COc1ccc(C)cc1', 'CC(C)(C)C(=O)NCC(N)=O', 'CC(C)(C)C(N)=O', 'COc1ccc(CNC(C)=O)cc1', 'COc1ccccc1', 'CNC(=O)CNC(=O)C(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.