Calcitriol-dehydroxytrimethylsilyl-3,5-O-tert-butyldimethylsilyl-d6 is an intermediate used in the synthesis of Calcitriol-d6 (C144502), which is the biologically active form of vitamin D3. Calcium regulator; vitamin (antirachitic); antihyperparathyroid; antineoplastic; antipsoriatic.