1β-CALCITRIOL is an Impurity B of Calcitriol. Calcitriol(1,25-Dihydroxyvitamin D3; Rocaltrol ) is the hormonally active form of vitamin D, Calcitriol is the active metabolite of vitamin D3 that activates the vitamin D receptor (VDR). 1-epicalcitriol is a potent antagonist of 1,25(OH)2D3-induced intestinal calcium transport (transcaltachia).

24-Cyclopropyl-1α,3β-BIS(((1,1-Dimethylethyl)dimethylsilyl)oxy)-9,10-secochola-5,7,10(19),22-tetraen-24-ol, (5Z,7E,22E,24S)- is the tert-Butyldimethylsilyl ether conjugate of Calcipotriene (C144200), a vitamin D3 analogue with potential antitumor activities. 24-Cyclopropyl-1α,3β-BIS(((1,1-Dimethylethyl)dimethylsilyl)oxy)-9,10-secochola-5,7,10(19),22-tetraen-24-ol, (5Z,7E,22E,24S)- is used in Calcipotriol synthesis. The physiological and toxicological properties of this compound have not been evaluated.