['CC(C#N)CN(C)CC=O', 'Fc1ccc(N2CCNCC2)cc1', 'CC(C)C#N', 'CNCC(=O)N1CCN(c2ccc(F)cc2)CC1', 'CNCC(C)C#N', 'CC(=O)N1CCN(c2ccc(F)cc2)CC1', 'Fc1ccccc1', 'CC(C#N)CN(C)CC(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCNCC2)cc1.