FIELD: organic chemistry, medicine. SUBSTANCE: invention relates to novel condensed pyrrolo[2,3-c]carbazol-6-ones presented by general formulas (I) 
and (II) 
where R1 means H, C1-C4-alkyl; R2 means H, C1-C8-alkyl; each of R3 and R4 means independently H, OH, C1-C8-alkyl; R5 means H, C1-C8-alkyl, C1-C8-alkenyl optionally substituted with CF3; X means -N-, -O-, -S-, alkylene with 1-3 carbon atoms. Compounds of formulas (I) and (II) potentiate activity of human IFN-γ in induction of MHC expression on surface receptive cells and they are able to inhibit growth of virus and/or tumor. EFFECT: valuable antiviral and antitumor properties of compounds. 13 cl, 7 dwg, 2 tbl, 6 ex
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