['NC1CCCC1', 'CC(C#N)CN(C)CC=O', 'CC(C)C#N', 'CNCC(=O)NC1CCCC1', 'CNCC(C)C#N', 'CC(=O)NC1CCCC1', 'C1CCCC1', 'CC(C#N)CN(C)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCCC1.