['CO', 'C#CCOCc1ccc(C=O)cc1', 'C#CC', 'COC(=O)c1ccc(CO)cc1', 'C#CCO', 'COC(=O)c1ccc(C)cc1', 'COC=O', 'C#CCOCc1ccccc1', 'C#CCOC', 'COC(=O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.