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Figure 4
All 17 possible carboxyl–carboxyl(ate) dimers with accompanying nomenclature. The cyclic dimer is represented in the top left box; the eight `carbonyl dimers' involving a hydroxyl donor and a carbonyl acceptor group are represented in the top right box; the four `hydroxyl dimers' involving a donor and acceptor hydroxyl group are represented in the central box (the two as-a and aa-s dimers not identified in the CSD are shaded); the four carboxyl–carboxylate dimers are represented in the bottom box.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 71| Part 2| March 2015| Pages 164-175
doi:10.1107/S205252061500270X
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