Chemically speaking, this molecule is "midway" between 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 in a very ratio of 2:three hence the "Sesqui" part during the molecule's name. A subtropical plant that thrives