Chemically Talking, this molecule is "halfway" between Sorbitan Oleate and Sorbitan Trioleate, this 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 that's why the "Sesqui" section while in the molecule's name. When looking for clean beau