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. 2022 Dec 3;27(23):8518. doi: 10.3390/molecules27238518

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Some diacetylpyridine-based acyclic pentadentate (N₃O₂) ligands: R = NH₂ (H₂dapsc), 2-OHC₆H₄ (H₄daps); 4-OCH₃C₆H₄ (H₂dapmbh), C₆H₅ (H₂dapbh), C₆H₅-C₆H₄ (Biph), CH₃CHOH (l-daplh).