['CNCCC#N', 'O=CNCc1ccccc1', 'CN(C=O)CCC#N', 'NCc1ccccc1', 'CCC#N', 'CNC(=O)NCc1ccccc1', 'Cc1ccccc1', 'CN(CCC#N)C(N)=O', 'c1ccccc1', 'CNC(=O)N(C)CCC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.