['CCOCCCC=O', 'CCOC1CCCNC1', 'CC', 'CCOC1CCCN(C(=O)CCCO)C1', 'CCO', 'CCCC(=O)N1CCCC(OCC)C1', 'CCOCCCC(=O)N1CCCC(O)C1', 'CCOCCCC(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.