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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/).
Synthesis and designation of the chiral precursors prepared by three different methods; (A) four step method using oxidation of an aldehyde as an intermediate step, (B) and (C) direct acylation of 4-hydroxybenzoic acid with the chiral acid under different conditions.