['CC=O', 'CC(NC(=O)c1csc(N)n1)C(=O)NC(C)(C)C', 'CC(N)C(=O)NC(C)(C)C', 'CC(=O)Nc1nc(C=O)cs1', 'CC(C)(C)N', 'CC(=O)Nc1nc(C(=O)NC(C)C=O)cs1', 'CCC(=O)NC(C)(C)C', 'CC(=O)Nc1nc(C(N)=O)cs1', 'CC(C)C', 'CC(=O)Nc1nc(C(=O)NC(C)C(N)=O)cs1', 'CC(N)=O', 'CC(NC(=O)c1cscn1)C(=O)NC(C)(C)C', 'CC(=O)Nc1nccs1', 'CC(NC=O)C(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.