['C#CCN', 'O=C[C@@H]1C[C@H]1c1ccc(F)cc1', 'C#CC', 'NC(=O)[C@@H]1C[C@H]1c1ccc(F)cc1', 'C#CCNC=O', 'Fc1ccc(C2CC2)cc1', 'Fc1ccccc1', 'C#CCNC(=O)C1CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(C2CC2)cc1.