['CCO', 'O=CCOC[C@H]1CCCCO1', 'CC', 'O=C(O)COC[C@H]1CCCCO1', 'CCOC(C)=O', 'OC[C@H]1CCCCO1', 'CCOC(=O)CO', 'C[C@H]1CCCCO1', 'C1CCOCC1', 'CCOC(=O)COC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCOCC1.