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Figure 2
(a) Chemical structure of pimelic acid (DA7); the torsions at both ends of the molecule are defined as τ1 and τ2. (b) Molecular conformations of form I (green) and form II (red) for comparison; τ1 and τ2 are the main differences between the two forms. (c) Schematic of chemical structures of the diacids as additives with different numbers of carbon atoms, n = 2, 3, 4, 5, 6, 8, 9, 10, 11.

IUCrJ
Volume 8| Part 2| March 2021| Pages 161-167
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521000063