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. 2016 Mar 9;21(3):320. doi: 10.3390/molecules21030320

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Synthesis of an expanded porphyrin and a pyriporphyrin [35,36].