FIELD: biochemistry. SUBSTANCE: described are new somastatinic peptides of general formula I: 
wherein M is H or cation-forming acid addition salts; A is Phe or Tyr in free form or in the form of salt or complex with radionuclide. Said peptides are useful as radiopharmaceutical agents provided they are complexes with alpha- or beta-radiating radionuclides or nuclide with Au-ger-e cascades. EFFECT: improved properties of the pharmaceutical composition. 13 cl, 6 ex
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