['CC=O', 'CC(=O)c1csc(NC(=O)[C@@H](N)C(C)C)n1', 'CC(=O)c1csc(N)n1', 'CC(=O)N[C@H](C=O)C(C)C', 'CC(N)=O', 'CC(=O)c1csc(NC(=O)CC(C)C)n1', 'CC(=O)c1cscn1', 'CC(=O)N[C@H](C(N)=O)C(C)C', 'CC=O', 'CC(=O)N[C@H](C(=O)Nc1nccs1)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.