Chemically speaking, this molecule is "midway" amongst Sorbitan Oleate and Sorbitan Trioleate, that means that it's also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but in a ratio of two:three hence the "Sesqui" component while in the molecule's title. When Farmacy suggests "makeup