Vitamin K 2 |
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| Menaquinones; Vitamin K Quinone; Vitamin K2 | |
| A group of substances similar to VITAMIN K 1 which contains a ring of 2-methyl-1,4-naphthoquinione and an isoprenoid side chain of varying number of isoprene units. In vitamin K 2, each isoprene unit contains a double bond. They are produced by bacteria including the normal intestinal flora. | |