Vitamin K 2

**Definition:** 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.

**Tree numbers:** - D02.455.426.559.847.638.721.374.844 - D02.455.849.291.523.500.844 - D02.806.550.750 - D04.615.638.721.374.844

**Synonyms:** - Menaquinone - Vitamin K Quinone - Vitamin K2 - Menaquinones