['N#Cc1ccc(N)cc1', 'CC(C)CN(CC=O)CC(C)C', 'CC(C)C', 'CC(C)CNCC(=O)Nc1ccc(C#N)cc1', 'CC(C)CNCC(C)C', 'CC(=O)Nc1ccc(C#N)cc1', 'N#Cc1ccccc1', 'CC(C)CN(CC(N)=O)CC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.