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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 (https://creativecommons.org/licenses/by/4.0/).
(a) Three kinds of BOC-glycine. Three kinds of BOC-glycine 2,5-furandimethyl ester using different dosages of DCC (b) before and (c) after BOC removal: (1) 0.625 mol/L. (2) 1.25 mol/L. (3) 1.875 mol/L.