['CC#N', 'CC(=O)c1ccc(N2CCNCC2)cc1', 'N#CCN1CCNCC1', 'CC(=O)c1ccccc1', 'CC=O', 'N#CCN1CCN(c2ccccc2)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCNCC2)cc1.