Chemically Talking, this molecule is "midway" among Sorbitan Oleate and Sorbitan Trioleate, which means that it's also an attachment of sorbitan (a dehydrated sorbitol (sugar) molecule) with the unsaturated fatty acid Oleic Acid, but inside of a ratio of two:three that's why the "Sesqui" component inside the molecule's title. I also like this is i