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The synthesis of human proinsulin fragment residues 40-60 by a solid phase method based on polydimethylacrylamide is described. Nineteen of the amino-acids were introduced as N alpha-(9-fluorenylmethoxycarbonyl) derivatives; functional side chains were protected as t-butyl ethers and esters. The yield of highly purified 21-residue peptide was 56.5%.

Synthesis of a 21-Residue Fragment of Human Proinsulin by the Polyamide Solid Phase Method