['CCNCC#N', 'N#Cc1ccc(C=O)cc1', 'CC', 'N#CCNC(=O)c1ccc(C#N)cc1', 'CC#N', 'CCNC(=O)c1ccc(C#N)cc1', 'CCN(C=O)CC#N', 'N#Cc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.