Purity >98%. 7Z,10Z,13Z,16Z-Docosatetraenoic acid is a naturally occurring polyunsaturated fatty acid (PUFA) formed through a 2-carbon chain elongation of arachidonic acid. It is present in the adrenal glands, brain, testis, and kidney. Although there is trace metabolism of adrenic acid in the forebrain, the renal medulla is the only tissue which readily metabolizes the acid through cyclooxygenase activity. The primary metabolite of 7Z,10Z,13Z,16Z-docosatetraenoic acid in the rabbit kidney is 1a,1b-dihomo prostaglandin E2 .