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![[Figure 4]](yp3238fig4mag.jpg)
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Figure 4
The structural model of L-histidine. An asymmetric unit superimposed with the Fobs–Fcalc map contoured at 3σ calculated (a) before any H atoms were added and (b) before adding the last H atom. H-atom positions were placed where they were expected to be based on the positive density peaks from the Fobs–Fcalc omit map. Positive peaks are shown in green and negative ones are shown in red. The structure model viewed along the (c) [100], (d) [010] and (e) [001] directions, showing the hydrogen-bond network. |
![[Figure 4]](yp3238fig4.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
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