['CC1(C)CCC(C=O)O1', 'N#CCC1CCNCC1', 'CC1(C)CCCO1', 'N#CCC1CCN(C=O)CC1', 'CC#N', 'CC1(C)CCC(C(=O)N2CCCCC2)O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C1CCCO1)N1CCCCC1.