Adenine hydrochloride, hydrogen

The determination of the structure of adenine hydrochloride (see Volume 2, Section IV,K, of article IV by Katritzky and Lagowski) is an example of extremely accurate X-ray crystallography whereby the positions of individual hydrogen atoms were located. An example of the deduction of structure from bond lengths between heavy atoms is provided by Penfold s investigation of pyrid-2-thione. ... 

Fig. 12. A drawing of the crystal structure of adenine hydrochloride hemi-hydrate. Hydrogen bonds are indicated by dashed lines. The dimensions were calculated from the coordinates given by Cochran (11).

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