['CNC', 'Cc1noc(N)c1-c1cccc(Cl)c1', 'CN(C)C', 'Nc1oncc1-c1cccc(Cl)c1', 'Clc1ccccc1', 'CN(C)Cc1cc(N)on1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2cnoc2)cc1.