Pumpkin seed oil contains fatty acids, such as oleic acid and alpha-linolenic acid. Oleic acid is the most common monounsaturated fatty acid in nature. Murumuru butter contains lauric, myristic, and oleic acids. In effect, stearic acid is dehydrogenated to give the monounsaturated derivative, oleic acid. Monounsaturated oleic acid is also a major constituent of palm oil. It is formed from the precursor oleic acid (a monounsaturated fatty acid). Oleic acid is a common monounsaturated fat in human diet. The high oleic variety sunflower oil contains at least 70% monounsaturated fat. It is an unsaturated fatty amine related to the fatty acid oleic acid. Oleic acid undergoes the reactions of carboxylic acids and alkenes. Linoleic acid (C18&colon;2) is the dominant PUFA, followed by oleic acid (C18&colon;1). Polysorbate 80 is derived from polyethoxylated sorbitan and oleic acid. It is the amide derived from the fatty acid oleic acid. Reaction with acetic anhydride and oleic acid gives bismuth trioleate. Another naturally occurring isomer of oleic acid is petroselinic acid.