FIELD: organic chemistry, pharmacy. SUBSTANCE: invention relates to N, N'-diacetylcystine organic base salt in L-form (DiNAc) of the general formula -OOCCH(NHCOCH3)CH2S-SCH2CH(NHCOCH3)CH-COO- 2R+ or -OOCCH(NHCOCH3)CH2S-SCH2CH(NHCOCH3)CH-COO- R+ where R+ and R2+ - a cation of an organic base lysine, ethylenediamine, N,N'-dibenzylethyl- -enediamine, adamantaneamine, N-benzyl-2-phenylethylamine or piperazine. Compounds are synthesized by treatment of DiNAc with an organic base or salt containing cations of organic bases. New salts DiNAc are crystallized easily, they show chemical stability, immunomodulating activity and nonhygroscopicity. EFFECT: improved method of synthesis and properties of compounds. 9 cl, 2 tbl, 19 ex
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