CAS 1182-68-9: 2-[(2E,6E,10E,14E,18E)-icosa-2,6,10,14,18-pentaen-1-yl]-3-methylnaphthalene-1,4-dione

Menaquinone 5 is a type of vitamin K, which is synthesized by bacteria. It is considered a dietary supplement that can be found in some foods and supplements. Menaquinone 5 is also present in the human body, where it helps to maintain the supply of calcium necessary for healthy bones and teeth. The hydroxyl group on menaquinone 5 can be oxidized by bacterial enzymes to form menadione, which is a potent inhibitor of bacterial growth. Menadione has been shown to inhibit the production of all-trans retinoic acid (ATRA) in cells and stimulate the synthesis of RNA and DNA in cell culture studies. Menaquinone 5 has also been shown to have an inhibitory effect on bacteria that produce subtilisin, such as Staphylococcus aureus, Bacillus subtilis, and Escherichia coli.