Chemically Talking, this molecule is "midway" amongst Sorbitan Oleate and Sorbitan Trioleate, that means that it is also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but inside of a ratio of two:3 for this reason the "Sesqui" section during the molecule's identify. If you prefer oil