['CCC(N)=O', 'CC(C)(C)c1nc(CN)cs1', 'CC(N)C(N)=O', 'Cc1csc(C(C)(C)C)n1', 'CNC(C)C(N)=O', 'CC(C)(C)c1nccs1', 'CC(C)C', 'CC(NCc1cscn1)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.