Calcipotriol impurity D is a synthetic analogs of vitamin D that was studied for its potential antitumor effects. Studies has shown the combined treatment with vitamin D analog (24R)-Calcipotriene was more effective than the treatment with cytostatics applied alone. (24R)-Calcipotriene is also the 24-R epimer of Calcipotriene.
Wietrzyk, J., et al.: Anticancer. Res., 27, 3387 (2007); Tien, X.Y., et al.: Am. J. Physiol., 265, 143 (1993); Wietrzyk, J., et al.: Anti-Cancer. Drugs., 18, 447 (2007).