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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/).
Structures of the 1,3,4-thiadiazole-derived ligands 1, 2, 3, and the numbering system of atoms (red) used for the assignment of the 1H and 13C NMR chemical shifts.