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. 2019 Feb 25;7:93. doi: 10.3389/fchem.2019.00093

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Copyright © 2019 Wang, Huang, Su and Ger.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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¹H-NMR spectrum showed the proton signal δ = 1.15 ppm of PNDU-COOCH₃; δ = 2.85 ppm of NIPAAm, and δ = 1.29 of DMAAm which verified the PNDU-COOCH₃ composed of NIPAAm, DMAAm, and UA.