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structure 1  has been refined with too few data and/or too many parameters (data-to-parameter ratio 3.68), resulting in esd¡¯s that are twice as large as the typically acceptable values. While the bond length and angle uncertainties are not as large as to put a doubt on the correctness of the molecular structure, I would recommend that the authors try the following:
1. Refine the aromatic ring of this structure as idealized rigid hexagon.
2. Atom H9 (and H9¡¯) is in a chemically impossible position with C9 having a square pyramidal geometry£¨·½×¶ÐΣ©. This has to be corrected.

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