7-dehydro Cholesterol needs the UV to break open the B ring and make ready to be used as a vital vitamin (notice it's called a vitamin but NO amine nitrogen is present so this where it gets ambiguous with naming and grouping things....Double bonds and alcohols that's what to look for in reactions with the steroid rings of Vitamin D -four molecules (remember the Tryptophan all hte way through serotonin to melatonin????) adding alcohols (see glycolysis reactions too....) FOUR MAJOR Vitamin D molecules


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