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Structures of 1α,25-dihydroxyvitamin D3 (1α,25(OH)2D3) and a Gemini vitamin D analog BXL0124 [1α,25-dihydroxy-20R-21(3-hydroxy-3-deuteromethyl-4,4,4-trideuterobutyl)-23-yne-26,27-hexafluoro-cholecalciferol].