Chemically speaking, this molecule is "midway" between Sorbitan Oleate and Sorbitan Trioleate, indicating that it's also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but in a very ratio of 2:3 that's why the "Sesqui" part inside the molecule's identify. I also like this is within a