Chemically Talking, this molecule is "midway" involving Sorbitan Oleate and Sorbitan Trioleate, that means that it's also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but within a ratio of two:three hence the "Sesqui" part in the molecule's name. I also like this is inside a tub, I