The invention is related to medicine, in particular, to oncology and immunology. The novel compounds of the general formula 1 or 2, exhibiting affinity for CD16a receptor have been proposed. There were also proposed novel modified proteins active towards CD16a receptor, selected from antibody or autogen conjugated by a modifying compound selected from compound of the general formula 1 or 2, which stimulate and direct antibody-dependent cellular cytotoxicity. The novel modified proteins (conjugates) could be used for destruction of definite targeted group of cells in organism, for example, cancerous cells or autoimmune lymphocytes. There were also proposed methods for conjugate preparation, pharmaceutical composition, and medicament, comprising modified proteins for treating oncology and autoimmune diseases.
