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Appearance: Light Yellow Oil /// Application Notes: Vitamin D2 O-t-Butyldimethylsilyl Ether is an impurity of Vitamin D2 (V676040), which is a synthetic form of Vitamin D. Prepared from ergosterol by UV irradiation in a suitable solvent. Commercial solutions are usually made with propylene glycol or sesame oil. Antirachitic.Vitamin D2 O-t-Butyldimethylsilyl Ether is also an intermediate in synthesizing (7Z)-Calcipotriene (C144225), which is an isomeric impurity of Calcipotriene (1442000), a vitamin D3 analogue with low calcemic activity. /// References: Knudson, B., et al.: J. Biol. Chem., 124, 287 (1938), Huber, B., et al.: J. Biol. Chem., 149, 125 (1943), Crowfoot, D., et al.: Nature, 162, 608 (1948), Suda, et al.: Biochem. Biophys. Res. Commun., 35, 182 (1969)