['C#CCN', 'Cc1cccc(C2(C(=O)C(C#N)C=O)CC2)c1', 'C#CC', 'Cc1cccc(C2(C(=O)C(C#N)C(N)=O)CC2)c1', 'Cc1cccc(C2CC2)c1', 'C#CCNC(=O)C(C#N)C=O', 'Cc1ccccc1', 'C#CCNC(=O)C(C#N)C(=O)C1CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(C2CC2)cc1.