['O=CN1CC2CCC(C1)O2', 'Cc1cccc2c1OCC[C@H]2N', 'C1CC2CNCC1O2', 'Cc1cccc2c1OCC[C@H]2NC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@@H]1CCOc2ccccc21)N1CC2CCC(C1)O2.