Chemically speaking, this molecule is "halfway" in between 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 a ratio of two:3 that's why the "Sesqui" part from the molecule's name. Quite a few reports say it do