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. 2016 Apr 12;6(4):336–343. doi: 10.1016/j.apsb.2016.03.010

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© 2016 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — Synthesis and the composition confirmation of FA-SPE-PEG. (A) Proposed reaction scheme for FA-SPE-PEG. (B) Representative ¹H NMR spectrum of FA-SPE-PEG in D₂O: (a) δ 1.6 and (b) δ 1.8 ppm (–CH₂–, SPE); (c) δ 2.7–3.2 ppm (–NH–CH₂–, SPE); δ 4.1–4.3 ppm (–CH₂–, PEG); (*) δ 7.8 ppm (methylene, FA).