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. 2014 Apr 22;12(4):2308–2325. doi: 10.3390/md12042308

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Scheme 4 — Synthesis of analogues with modification on the N-terminus. Reagents and conditions: (a) DEA/CH₃CN; (b) EDC/HOAt, pentanoic acid, 17%; (c) EDC/HOAt, hydroxyacetic acid, 26%.