['C#CCN', 'CN(CC=O)Cc1cccc(C#N)c1', 'C#CC', 'CN(CC(N)=O)Cc1cccc(C#N)c1', 'C#CCNC(C)=O', 'CNCc1cccc(C#N)c1', 'Cc1cccc(C#N)c1', 'C#CCNC(=O)CNC', 'N#Cc1ccccc1', 'C#CCNC(=O)CN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.