Chemically speaking, this molecule is "halfway" among Sorbitan Oleate and Sorbitan Trioleate, this means that it is also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but within a ratio of 2:3 as a result the "Sesqui" part during the molecule's identify. I also like this is in a tub,