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Figure 1
Molecular structures of the amino acids studied: (a) 2-aminobutyric acid, (b) norvaline, (c) norleucine, (d) 2-aminoheptanoic acid, (e) 2-aminooctanoic acid and (f) methionine.

IUCrJ
Volume 7| Part 2| March 2020| Pages 331-341
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520001335