['CCO', 'C=CC(C)N1CCCC(C=O)C1', 'CC', 'C=CC(C)N1CCCC(C(=O)O)C1', 'C=CCC', 'CCOC(=O)C1CCCNC1', 'CCOC=O', 'C=CC(C)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.