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. 2010 Jun 27;7(4):213–223. doi: 10.7150/ijms.7.213

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© Ivyspring International Publisher. This is an open-access article distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by-nc-nd/3.0/). Reproduction is permitted for personal, noncommercial use, provided that the article is in whole, unmodified, and properly cited.

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(Scheme 7) shows the PNA building block Fmoc protected and functionalized with 4-pentenoic acid 17 acting as a dienophile component. According to the scheme 6 the synthesis consists of two procedures and was carried out as described in the footnote⁴.