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yunyatou

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The main concern is about amine H atom (H1), which is misplaced. The calculated position for that atom assumes a trigonal geometry for N1, although such N atom is almost certainly not planar. Indeed H1 may be found easily in a difference map and treated as a free atom (free coordinates and isotropic displacement parameter). Refinement including H1 with free coordinates converges to R1 = 3.6%, a 0.2% drop compared with your current refinement, and N1 is slightly tetrahedral, as expected. Finally, intramolecular H bond is more accurate after refining in that way. For instance, separation O...H is close to 1.92 A, significantly different from the separation observed in the current refinement (O...H: 2.09 A).
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huahua1216

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yunyatou(½ð±Ò+1,VIP+0): 12-16 14:51
eeqeeq0002(½ð±Ò+1,VIP+0):лл ²ÎÓë 12-16 20:20
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huofj2008

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brilliant

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yunyatou(½ð±Ò+1,VIP+0): 12-16 14:51
eeqeeq0002(½ð±Ò+1,VIP+0):лл ²ÎÓë 12-16 20:20
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