565404.fig.007a
(a)
565404.fig.007b
(b)
565404.fig.007c
(c)
Figure 7: (a) Cambridge Crystallographic Database (CSD) search queries for intramolecular hydrogen bond in the presence and in the absence of two water molecules bound to the carboxylate and carboxylic groups, respectively. C (gray), N (blue), any group (cyan), H (light-yellow), and O (red). (b) Plot of the number of structures versus the distances (NO) and (NO=C) in the absence of a water molecule. (c) Plot of the number of structures versus the distances (NO) and (NO=C) in the presence of two water molecules bound to the carboxylate and the carboxylic groups, respectively.