['CC(C)C=O', 'C[C@@H]1CC=CC[C@H]1C(=O)N1CCCNCC1', 'C[C@@H]1CC=CC[C@H]1C=O', 'CC(C)C(=O)N1CCCNCC1', 'C[C@@H]1CC=CCC1', 'CC(C)C(=O)N1CCCN(C=O)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C([C@@H]1CC=CCC1)N1CCCNCC1.