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Figure 2
(a) The tetrameric unit of two carboxylic acid–imide heterodimers. (b) The tetrameric unit of an acid-flanked imide homodimer. Both (a) and (b) have been calculated to be less stable (Moragues-Bartolome et al., 2012BB40) and hence less likely to occur in co-crystals. (c) The reported SM–24DHBA co-crystal shows the Thomo unit, with the crucial stabilization and propagation of the unit via para-OH⋯carbonyl (imide) hydrogen bonds. Dashed lines indicate hydrogen bonds.

IUCrJ
Volume 2| Part 3| April 2015| Pages 341-351
ISSN: 2052-2525
doi:10.1107/S2052252515002651