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Vitamin K2(5) is an analog of Vitamin K that acts as a reducing agent and also acts as an electron carrier in the electron transport chain of many bacteria. Intake of Vitamin K2(5) is associated with a reduced risk of coronary heart disease.

ChEBI: Menaquinone is any member of the class of menaquinones that is 2-methyl-1,4-naphthoquinone with an unsaturated isoprenoid chain at the 3-position. It has a role as an Escherichia coli metabolite. It is a vitamin K and a member of menaquinones.

The Journal of Organic Chemistry, 36, p. 3951, 1971 DOI: 10.1021/jo00824a023
Tetrahedron Letters, 36, p. 2773, 1995 DOI: 10.1016/0040-4039(95)00394-R