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. 2023 Feb 9;15(2):590. doi: 10.3390/pharmaceutics15020590

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© 2023 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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XRF spectra of synthesized Zn(Met)₂ (red) and crystallized Zn(Met)₂(SO₄)_x complexes (blue) at the characteristic energy of zinc fluorescence—zinc K_α line of 8.632 keV and zinc K_β line of 9.572 keV.