['CCc1ccccc1', 'Cc1nc(C#N)c(N)o1', 'Cc1nc(C#N)co1', 'C[C@@H](N)c1ccccc1', 'c1ccccc1', 'CCNc1oc(C)nc1C#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(CNc2cnco2)cc1.