Arachidonoyl Chloride is a derivative of Arachidonic Acid (A765000), an essential fatty acid and a precursor in the biosynthesis of prostaglandins, thromboxanes, and leukotrienes. Arachidonic Acid occurs in liver, brain, glandular organs, depot fats of animals, in small amounts in human depot fats, and is also a constituent of animal phosphatides.