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. 2017 Oct 25;9(11):551. doi: 10.3390/polym9110551

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© 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Tentative mechanism of the ring-opening polymerization of NCAs (ZLLys, R = (CH₂)₄NHC(O)OCH₂C₆H₅) using primary amine–hydrochlorides (chloride ions omitted). Reproduced with permission from reference [68].