FIELD: chemistry.
SUBSTANCE: radiopharmaceutical agent of formula (Ia) 
or (Ib) 
, is a cyclic octapeptide complex which contains a chelating group with radionuclides 111In, 90Y, 177Lu. The radiopharmaceutical agent can be used to produce medicinal agents for radionuclide therapy of neoplasms which express somatostatin receptors. X is a chelating agent.
EFFECT: improved properties.
2 cl, 1 dwg, 2 tbl, 6 ex
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