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. 2016 Aug 19;7:305. doi: 10.3389/fimmu.2016.00305

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Copyright © 2016 Song, Chen, Jiang, Yang, Li, Zhao, Ouyang, Fan and Yuan.

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) or licensor 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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The PDAPEI structure was confirmed using ¹H NMR and FT-IR. (A) NMR of PDAPEI. Chemical shifts at δ7.7 ppm of the ¹H NMR spectrum are attributed to the protons of 2,6-pyridinedicarboxaldehyde. (B) IR of PDAPEI. This attribution is in agreement with the stretching vibration of the carbonyl group at 1,651 cm⁻¹ in the FT-IR spectrum for 2,6-Pyridinedicarboxaldehyde carbonyls.