Figure 10: Typical examples of impurities observed in synthesized peptides: desamidation of Asp in desmopressin; 3-9 truncated buserelin; acetyl felypressin; cyclic protirelin; incomplete removal of p-cresol scavenger in SBO215-7; incomplete removal of protecting group Pmc on Arg; insertion of proline in goserelin and oxidized Trp in leuprorelin.