7-Dehydrositosterol
Encyclopedia
7-Dehydrositosterol is a sterol
Sterol
Sterols, also known as steroid alcohols, are a subgroup of the steroids and an important class of organic molecules. They occur naturally in plants, animals, and fungi, with the most familiar type of animal sterol being cholesterol...

 which serves as a precursor for sitocalciferol (vitamin D5
Vitamin D5
Vitamin D5 is a form of vitamin D.Analogues have been proposed for use as antitumor agents....

).
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