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