['CCC', 'OCCOCCC1CCNCC1', 'CC(C)O', 'CCOCCC1CCNCC1', 'CCOC(C)C', 'OCCC1CCNCC1', 'CC(C)OCCO', 'CCC1CCNCC1', 'C1CCNCC1', 'CCOCCOC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.