Reduces aspartimide formation, particularly in Asp-Gly sequences.Ref: 1. J.P. Tam, et al. Tetrahedron Lett., 42: 4033, (1979); 2. E. Nicolas, et al. Tetrahedron Lett., 30: 497, (1989); 3. B. Penke, G. Jung and E. Bayer (Eds.) Walter de Gruyter, Berlin, et al. in "Peptides 1988, Proc 20th European Peptide Symposium", 67, (1989).