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Fibrinogen-related peptides, monomeric cyclic peptides through a disulfide bond [cyclo(H-Cys-Arg-Gly-Asp-Phe-Cys-NH2), cyclo(H-Cys-Arg-Gly-Asp-Phe-Cys-Gly-NH2), cyclo(H-Cys-Arg-Gly-Asp-Cys-NH2) and cyclo(H-Cys-Arg-Gly-Asp-Cys-Gly-NH2)], were prepared by the solid phase method with disulfide bond formation on the solid support. The acetamidomethyl group was used for protection of the thiol group of Cys and synthetic peptide-resins were treated with iodine to give the disulfide bond. Monomeric cyclic peptides were obtained as main products. Purified S-acetamidomethylated peptides were also oxidized with iodine, but the desired materials could not be isolated by HPLC. The disulfide formation from S-acetamidomethylcysteine-containing peptide resin by iodine treatment on the solid support was more effective than that from S-acetamidomethylcysteine-containing peptide. The inhibitory effect of the cyclic peptides on platelet aggregation were much more potent than that of H-Arg-Gly-Asp-NH2.

Amino Acids and Peptides. XXVII. Solid Phase Synthesis of Fibrinogen-Related Peptides with Disulfide Bond Formed on Solid Support.