Chemically Talking, this molecule is "halfway" among Sorbitan Oleate and Sorbitan Trioleate, indicating that it's 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" element during the molecule's name. Apply to clean skin each mornin