Leucyl-Phenylalanyl-Isoleucyl-Glutamyl-Tryptophyl-Leucyl-d3-Lysine Trifluoroacetate is labelled Leucyl-Phenylalanyl-Isoleucyl-Glutamyl-Tryptophyl-Leucyl-Lysine Trifluoroacetate (L330190), a metabolite from Exenatide trypsin (Exenatide Acetate, E957300) digestion. Exenatide acts as agonist of the glucagon-like peptide-1 (GLP-1) receptor.