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. 2015 Sep 9;20(9):16306–16319. doi: 10.3390/molecules200916306

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 2 — Structures and synthesis route of DDK derivatives [15]. 1: DDK; 2: DK; 3: 4-Hydroxy-6-(2-phenylethyl)-2H-pyran-2-one; 4: Dimethyl-[6-2-phenyethyl]-2-oxo-2H-pyran-4-yl]-phosphorothionate; 5: Diethyl-[6-(2-phenylethyl)-2-oxo-2H-pyran-4-yl] phosphorothionate; 6: [6-(2-Phenylethyl)-2-oxo-2H-pyran-4-yl]-diphenylphosphorothionate.