['CCNCC#N', 'COc1ccc(C=O)cc1[N+](=O)[O-]', 'CO', 'CCN(CC#N)C(=O)c1cccc([N+](=O)[O-])c1', 'CC', 'COc1ccc(C(=O)NCC#N)cc1[N+](=O)[O-]', 'CC#N', 'CCNC(=O)c1ccc(OC)c([N+](=O)[O-])c1', 'CCN(C=O)CC#N', 'COc1ccccc1[N+](=O)[O-]']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.