['CCC', 'CC(C)(C)c1cnc(CN)o1', 'CC(C)N', 'Cc1ncc(C(C)(C)C)o1', 'CNC(C)C', 'CC(C)(C)c1cnco1', 'CC(C)C', 'CC(C)NCc1ncco1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cocn1.