FIELD: organic synthesis. SUBSTANCE: invention provides compounds of formula I: 
(I) wherein X represents C1-C20-alkyl, excepting butyl, heptyl, and hexadecyl; optionally C10C3-alkyl- substituted C3- C9-cycloalkyl, or C6-C12-aryl optionally substituted by 1-3 C1-C3-alkyl radicals. Compounds exhibit high immunomodulating activity and high bioavailability. EFFECT: extended choice of biologically active compounds. 2 tbl, 7 ex
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