FIELD: organic chemistry, chemical- -pharmaceutical industry. SUBSTANCE: invention relates to the drug that is 5-amino-2,3-dihydrophthalazine-1,4-dione sodium salt obtained from 3-nitrophthalic anhydride by the successive isolation of intermediate compounds: at first, 5-nitro-2,3- -dihydrophthalazine-1,4-dione and then, 5-amino-2,3-dihydro- -phthalazine-1,4-dione. After interaction of the latter compound with sodium hydroxide the end substance is obtained. EFFECT: high pharmacological activity of drug. 1 ex
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