FIELD: chemistry.
SUBSTANCE: invention relates to use of synthetic biologically active heterocyclic substances as purinoreceptor antagonists, said substances having antagonist activity on purinoreceptors and being a product of modifying pyridoxin, particularly n-(1,5-dihydro-3-R1-3-R2-8-methyl-9-hydroxy-[1,3]dioxepino[5,6-c]pyridinyl-6-azo)phenyl sulphonic acid and salt forms thereof of general formula I 
, where R1 is a hydrogen atom or methyl, R2 is methyl, isopropyl.
EFFECT: compounds of the given formula have high antagonist activity on purinoreceptors and can be used in medicine and veterinary.
2 tbl
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