Edward Doisy won a 1943 Nobel Prize for synthesizing this hemorrhage-inhibiting vitamin; isn't that "special"?
[DOC] [TLE] The Nobel Prize and the Discovery of Vitamins - Nobelprize.org [PAR] Jun 22, 2004 ... Vitamin A deficiency in humans, as well as rats, was later shown to produce 
serious .... and had a special interest in oxidation-reduction mechanisms in the 
body.