FIELD: medicine. SUBSTANCE: one should carry out extraction of reduced larch wood with aqueous solution of organic solvent, solvent's distillation and recrystallization of aqueous-phase precipitated residue. After recrystallization obtained product should be dissolved in aqueous solution of ethanol at heating, then obtained solution should be cooled up to 10 C, not higher. Precipitated residue should be filtered followed by repeated recrystallization in the mixture of acetonitril and aqueous solution of acetic acid. EFFECT: improved ecological value. 2 cl, 1 ex
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