Impurity of Alfacalcidol is an impurity of Alfacalcidol. Alfacalcidol is a non-selective VDR activator medication.

(24R)-MC 976 is a derivative of Vitamin D3.

MC 1046 is an impurity of Calcipotriol. Calcipotriol is a ligand of VDR-like receptors.

trans-Doxercalciferol is an isomer of Doxercalciferol. Doxercalciferol is an activator of the Vitamin D receptor and prevents renal disease.

(1S)-Calcitriol (1α,25-Dihydroxy-3-epi-vitamin-D3) is a natural metabolite of 1α,25-dihydroxyvitamin D3 (1α,25(OH)2D3). (1S)-Calcitriol exhibits potent vitamin D receptor (VDR)-mediated actions such as inhibition of keratinocyte growth or suppression of parathyroid hormone secretion[1]. 3‐epi‐Calcitroic acid is an end product of (1S)-Calcitriol (1α,25-Dihydroxy-3-epi-vitamin-D3; 3‐epi‐1a,25(OH)2D3) metabolism by rat CYP24A1[1]. [1]. Steve Y Rhieu, et al. Metabolic stability of 3-epi-1α,25-dihydroxyvitamin D3 over 1 α 25-dihydroxyvitamin D3: metabolism and molecular docking studies using rat CYP24A1. J Cell Biochem. 2013 Oct;114(10):2293-305.

Lexacalcitol is over 100 times more active than 1alpha,25-dihydroxyvitamin D3 [1alpha,25-(OH)2D3], as judged by in vitro antiproliferative and cell differentiating assays.

Calcipotriol Impurity C is an impurity of Calcipotriol, a ligand for VDR-like receptors.

1alpha, 24, 25-Trihydroxy VD2 is a vitamin D analog.

Febuxostat (TEI 6720) 是一种选择性黄嘌呤氧化酶(XO)抑制剂，Ki=0.6 nM。