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Molecular structures of the three forms of vitamin K. Vitamin K1, K2, and K3 share naphthoquinone ring, but differ in their side chains. Vitamin K1 has a phytyl side chain. Vitamin K2 has a side chain with varying number of isoprene units and called “MK-n” depending on the number of isoprene units. Vitamin K3 is a synthetic vitamin K without a side chain.
