['CC(C)C=O', 'CC(C)(C)C(=O)NCC(=O)NCc1cccc(N)c1', 'CC(C)(C)C(=O)NCC=O', 'CC(C)C(=O)Nc1cccc(CN)c1', 'CC(C)(C)C=O', 'CC(C)C(=O)Nc1cccc(CNC(=O)CN)c1', 'CC(C)(C)C(=O)NCC(N)=O', 'Cc1cccc(NC(=O)C(C)C)c1', 'CC(C)(C)C(N)=O', 'CC(=O)NCc1cccc(NC(=O)C(C)C)c1', 'CC(C)C(N)=O', 'CC(C)(C)C(=O)NCC(=O)NCc1ccccc1', 'CNC(=O)CNC(=O)C(C)(C)C', 'CC(C)C(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.