Notes: 3-oxo Stearic acid is an intermediate in the dissociated (or type II) fatty acid biosynthesis that occurs in bacteria and plants.{25141} This β-keto fatty acid is generated following the reaction of hexadecenoyl-acyl-carrier-protein (ACP) with malonyl-ACP by the enzyme β-ketoacyl-ACP synthase II, which produces 3-oxo octadecenoyl-ACP.{25140} Removal of the ACP group by ACP hydrolase produces the free acid.