['CC(C)(C)N', 'C[C@H](C=O)Sc1ncc2ccccn12', 'CC(C)C', 'C[C@@H](Sc1ncc2ccccn12)C(N)=O', 'CCC(=O)NC(C)(C)C', 'Sc1ncc2ccccn12', 'c1ccn2cncc2c1', 'C[C@@H](S)C(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccn2cncc2c1.