(D-Asp28)-Exenatide is an Exenatide (HY-13443) impurity. Exenatide is a long-acting glucagon-like peptide-1 receptor agonist[1].
References
[1] Doyle ME, et al. The importance of the nine-amino acid C-terminal sequence of exendin-4 for binding to the GLP-1 receptor and for biological activity. Regul Pept. 2003 Jul 15;114(2-3):153-8. DOI:10.1016/s0167-0115(03)00120-4
