['O=CC1CCC(=O)N1', 'CN[C@@H]1COC[C@H]1O', 'O[C@H]1CCOC1', 'CNC(=O)C1CCC(=O)N1', 'O=C1CCCN1', 'CN(C=O)[C@@H]1COC[C@H]1O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCC(C(=O)N[C@H]2CCOC2)N1.