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. 2020 Nov 18;21(22):8696. doi: 10.3390/ijms21228696

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Selected coordination modes of mono-deprotonated-2,3pydcH (top) and deprotonated-2,3pydc (bottom) forms of pyridine-2,3-dicarboxylic acid (2,3pydcH₂) in coordination with different metal ions reported in the literature [43,44,45,46,47,48,49,50,51,52,53,54,55].