['C#CCN', 'COc1ccc(F)cc1C=O', 'CO', 'C#CCNC(=O)c1cccc(F)c1', 'C#CC', 'COc1ccc(F)cc1C(N)=O', 'C#CCNC=O', 'COc1ccc(F)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.