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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/).
Three-dimensional structures of the complexes (A) NSP-4MSOB protonated at pH 5, and (B) ESP–4MSOB protonated at pH 3 and its interactions. In both complexes iron (Fe2+) was added as a cofactor (showed in yellow color).