['CCCl', 'c1ccc(Cc2ncon2)cc1', 'Cc1ccccc1', 'C[C@@H](Cl)c1ncno1', 'c1ccccc1', 'Cc1noc([C@@H](C)Cl)n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(Cc2ncon2)cc1.