['Cc1ccccc1', 'N#Cc1cc([N+](=O)[O-])c(N)c([N+](=O)[O-])c1', 'NCc1ccccc1', 'N#Cc1cc([N+](=O)[O-])cc([N+](=O)[O-])c1', 'c1ccccc1', 'CNc1c([N+](=O)[O-])cc(C#N)cc1[N+](=O)[O-]']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(CNc2ccccc2)cc1.