['COc1ccc(C=O)nn1', 'N[C@H]1CCCc2ccc(F)cc21', 'CO', 'O=C(N[C@H]1CCCc2ccc(F)cc21)c1cccnn1', 'COc1cccnn1', 'O=CN[C@H]1CCCc2ccc(F)cc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@H]1CCCc2ccccc21)c1cccnn1.