FIELD: biotechnology, more particularly preparation of biologically active sum of triterpenic acids. SUBSTANCE: method comprises steaming the original stock (wood green or fir bark) and subsequently drying and extracting it with organic solvent, treating extract with aqueous solution of alkali agent, acidifying and recovering the desired product. EFFECT: more efficient preparation method due to shorter extraction time, and increased yield of the desired product. 5 ex, 1 tbl
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