SYNTHESIS OF THE C-TERMINAL TETRAPEPTIDE SEQUENCE DERIVED FROM GLUCAGON ... BY H. C. BEYERMAN and J. S. BONTEKOE (Laboratory of Organic Chemistry, Technische Hogeschool, Delft, Netherlands) ... A synthesis is described of the partially protected carboxyl-terminal tetra- peptide sequence, L-leucyl-L-methionyl-L-asparaginyl-Ot-butyl-L-threonine t-butyl ester, which is derived from the pancreatic hormone glucagon. In this synthesis we ...