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. 2014 Apr 29;7(5):517–529. doi: 10.3390/ph7050517

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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 1 — Synthesis of cyclohexyldiethylenetriamine pentaacetic acid (5S,8S,22S,26S)-1-amino-5,8-dibenzyl-4,7,10,19,24-pentaoxo-3,6,9,18,23,25-hexaazaoctacosane-22,26,28-tri-carboxylic acid trifluoroacetate (CHX-A''-DTPA-DUPA-Pep).