['CC(C)(C)N', 'Nc1ncccc1OCC=O', 'Nc1ncccc1O', 'CC(=O)NC(C)(C)C', 'Nc1ccccn1', 'CC(C)(C)NC(=O)CO', 'CC(C)C', 'NC(=O)COc1cccnc1N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.