Linear and cyclic hymenistatin I (HS I) analogues with dipeptide segments Ile2-Pro3, Pro3-Pro4 and Val6-Pro7 replaced by their tetrazole analogues Ile-Ψ[CN4]-Ala3, Pro3-Ψ[CN4]-Ala4 and Val6-Ψ[CN4]-Alawere synthesized by the solid phase peptide synthesis method and cyclized with the TBTU and/or HATU reagent. The peptides were examined for their immunosuppressive activity in the lymphocyte proliferation test (LPT).
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