(E,E,E)-2-Acetyl-5,9,13,17-tetramethyl-4,8,12,16-octadecatetraenoic Acid Ethyl Ester is an intermediate in the synthesis of Menaquinone 6 (M218590). Menaquinones are isoprenoid quinones of the naphthalene series and belongs to the K2 Vitamin homologs. Menaquinones were originally discovered as the anti-hemorrhagic factor and now encompasses a variety of physiological processes. Menaquinone-6 were the major isoprenoid quinones found in membrane preparations of Campylobacter jejuni and Campylobacter fetus.