['CCCC', 'N[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O', 'CCCCN', 'OC[C@H]1OC[C@H](O)[C@@H](O)[C@@H]1O', 'CO', 'CCCCN[C@H]1OC[C@@H](O)[C@H](O)[C@H]1O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCOCC1.