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. Author manuscript; available in PMC: 2017 Mar 23.

Published in final edited form as: Anticancer Res. 2016 Mar;36(3):877–886.

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Chemical structures of vitamin D₃ (VD₃), 1α,25-dihydroxyvitamin D₃ (1,25D₃), 22-oxa-1α,25-dihydroxyvitamin D₃ (22-oxa-1,25D₃), 20S-hydroxyvitamin D₃ (20D₃) and its five Gemini analogs (10a–10e).