['CCNCC#N', 'COc1cc(C=O)cc(OC)c1', 'CO', 'CCN(CC#N)C(=O)c1cccc(OC)c1', 'CC', 'COc1cc(OC)cc(C(=O)NCC#N)c1', 'CC#N', 'CCNC(=O)c1cc(OC)cc(OC)c1', 'CCN(C=O)CC#N', 'COc1cccc(OC)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.