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