['O=C(O)c1ccccc1', 'N[C@@H]1OC[C@H](O)[C@@H](O)[C@@H]1O', 'O[C@H]1[C@H](O)COC[C@@H]1O', 'Nc1ccccc1C(=O)O', 'O=CO', 'O[C@H]1[C@H](O)[C@@H](O)CO[C@H]1Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N[C@H]2CCCCO2)cc1.