Fatty acid
In chemistry, particularly in biochemistry, a fatty acid is a carboxylic acid with a long aliphatic chain, which is either saturated or unsaturated. Most naturally occurring fatty acids have an unbranched chain of an even number of carbon atoms, from 4 to 28. Fatty acids are usually not found in organisms, but instead as three main classes of esters: triglycerides, phospholipids, and cholesterol esters. In any of these forms, fatty acids are both important dietary sources of fuel for animals and they are important structural components for cells.
Sapienic acid
Sapienic acid (16:1, n-10, cis-6 hexadecenoic, or sapienate) is a fatty acid that is a major component of human sebum. Sapienic acid is a sebum fatty acid that is unique to humans (from whose scientific name it takes the root "sapiens"). The equivalent fatty acid in mouse sebum is palmitoleic acid. Sapienic acid has been implicated in the development of acne, and it may have potent antibacterial activity.