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The chemical structure of Vitamin K. Phylloquinone is shown to contain repeating prenyl units, where it is bonded to the third carbon on the menadione ring. In comparison, MK-4 and MK-7 contain the same menadione ring, though it is the prenyl repeating units that bond to the third carbon. The length of the MK-7 chain is three units longer, which is what gives it a longer half-life compared to MK-4 [8].
