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![[Figure 1]](yp3167fig1mag.jpg)
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Figure 1
A hydrogen-bonded chain of alternating pyrazine and phthalic acid molecules, together with the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level, H atoms are shown as spheres of arbitrary radii and dashed blue lines represent hydrogen bonds. The nonlabelled halves of the pyrazine molecules are related to the labelled halves by the symmetry operations (−x + 2, −y + 1, −z + 1) (for pyrazine B) and (−x + 2, −y + 2, −z + 2) (for pyrazine C). |
![[Figure 1]](yp3167fig1.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
