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. 2019 Mar 20;24(6):1099. doi: 10.3390/molecules24061099

Figure 1.

Figure 1

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.