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Introduction. Skin cancers came first in Russia in numbers of oncological diseases. Melanoma, making up only a small part of these cases, leads to the most serious consequences. The nuclear medicine methods application is necessary at the stages of clarifying the diagnosis, searching for remote metastases and the treatment monitoring. The work is devoted to one of the stages of the radiopharmaceutical development for the diagnostics of malignant melanoma and its metastases based on the synthetic analog of α-melanocyte stimulating hormone (SAH) and radionuclide Tc-99m.Aim. The selection of optimal conditions for the preparation of the SAH ∙ 99mTc complex and the study of the using possibility it as a diagnostic tool in in vitro experiments.Materials and methods. Experimental work was carried out to optimize the conditions for obtaining the complex compound SAH ∙ 99mTc. The binding and internalization of this compound by B16-F0 melanoma cells has been studied.Results and discussion. The results of labeling SAH with a 99mTc radionuclide under a wide range of conditions were obtained both by the direct method and using the intermediate complex. The target compound rapidly binds to B16-F0 melanoma cells. The degree of internalization is more than 85 %.Conclusion. Based on the results of chemical experiments and data from in vitro experiments, optimal conditions for obtaining a complex compound SAH ∙ 99mTc with a radiochemical yield of more than 90 % were found. The mechanism of binding of this compound to malignant melanoma cells has been established.