FIELD: medicine. SUBSTANCE: method involves dissolving a sample of biologically active mixture of4,6-dinitro-5,7- dichlorobenzofuroxane, 4-nitro- 5,7-dichlorobenzofuroxane and 6-nitro-5,7-dichlorobenzofuroxane or medicament produced on this base in dimethyl sulfoxide, diluting at 1-4 105: 103, respectively, measuring optical density of the solution in the area of 4,6-dinitro-5,7-dichlorobenzofuroxane absorption strip having maximum at 470 nm. EFFECT: high accuracy of express-analysis; low costs. 1 tbl
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