['C#CCN', 'O=Cc1ccccc1OC(F)F', 'OC(F)F', 'C#CCNC(=O)c1ccccc1', 'C#CC', 'NC(=O)c1ccccc1OC(F)F', 'C#CCNC=O', 'FC(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.