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. 2018 Aug 31;19(9):2583. doi: 10.3390/ijms19092583

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© 2018 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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Chemical structure of vitamin D₃ analogs: 1,25(OH)₂D₃ (A), 25(OH)D₃ (B), calcipotriol (C) and 21(OH)pD (D).