FIELD: bioorganic chemistry, chemical technology, biology. SUBSTANCE: invention relates to new biologically active substances and to methods for their preparing. Invention proposes new synthesized polyoxyphenylene esters of the general formula (I) 
wherein R means -OH, -S-SO2-ONa; x = 1, 2; M means -OH, -O-C6H4-OH. Method for preparing polyoxyphenylene esters involves oxidation of hydroquinone with hydrogen peroxide in the presence of ferrous salts followed by addition of additional functional groups to the compound (HO)2C6H3-O-C6H4(OH)•H2O. New biologically active substances are nontoxic practically and they show the expressed combined antioxidant and anti-hypoxic effect. EFFECT: improved preparing method, valuable biological properties. 9 cl, 7 dwg, 9 tbl, 4 ex
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