['CN[C@@H]1COC[C@H]1O', 'O=CC1CC12CCOC2', 'O[C@H]1CCOC1', 'CNC(=O)C1CC12CCOC2', 'C1CC2(CC2)CO1', 'CN(C=O)[C@@H]1COC[C@H]1O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@H]1CCOC1)C1CC12CCOC2.