['CC(C)(C)NCC=O', 'COc1cccc(CN)c1', 'CO', 'CC(C)(C)NCC(=O)NCc1ccccc1', 'COc1cccc(C)c1', 'CC(C)(C)NCC(N)=O', 'CC(C)(C)N', 'COc1cccc(CNC(C)=O)c1', 'CC(C)C', 'COc1cccc(CNC(=O)CN)c1', 'COc1ccccc1', 'CNC(=O)CNC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.