FIELD: medicine, chemical-pharmaceutical industry. SUBSTANCE: method involves extraction of larch or Douglas fir the milled wood that is carried out at ethyl acetate boiling point at ratio raw to ethyl acetate = 1:(5-8). Extraction process is carried out for 1-5 h. Obtained extract is filtered and evaporated up to the dry residue preparing that is mixed with benzine or hexane at mass ratio = 1:(8-20), respectively. Mixture is kept for 15-40 min at 18-24 C at stirring and solvent is distilled off. EFFECT: improved method of preparing. 2 cl
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