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. 2017 Sep 10;15(9):285. doi: 10.3390/md15090285

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© 2017 by the author.

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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Putative cyclization routes of group III sponge merotriterpenoids, derived from 6,7-epoxyhexaprenyl diphosphate, including: (A) 3, 4, (B) and shaagrockol C (22).