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. 2016 Jul 23;14(8):139. doi: 10.3390/md14080139

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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 Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Structures of nitenin 117, dihydronitenin 118, furospongin-1 119, anhydrofurospongin-1 120, furospongin-2 121, isofurospongin-2 122, dihydrofurospongin-2 123, tetrahydrofurospongin-2 124, furospongin-3 125, and furospongin-4 126.