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. 2016 Mar 16;14(3):58. doi: 10.3390/md14030058

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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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(A) Gymnochrinus richeri. Postage stamp issued by the Office des Postes et Télécommunications (1988) (courtesy of a private collection); (B) Structure of gymnochrome A (65), B (66), C (67), D (68), isogymnochrome D (69), cholest-4-en-3-one (70) and cholesta-1,4-dien-3-one (71).

(A) Gymnochrinus richeri. Postage stamp issued by the Office des Postes et Télécommunications (1988) (courtesy of a private collection); (B) Structure of gymnochrome A (65), B (66), C (67), D (68), isogymnochrome D (69), cholest-4-en-3-one (70) and cholesta-1,4-dien-3-one (71).