['CC(N)C(N)=O', 'CCc1nc(C)cs1', 'CCC(N)=O', 'CCc1nc(CN)cs1', 'CC', 'CC(NCc1cscn1)C(N)=O', 'CNC(C)C(N)=O', 'CCc1nccs1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.