FIELD: chemistry.
SUBSTANCE: method involves selective extraction of neutral coniferous green extractive substances with solvents, hydrolysis and then column chromatography. A provitamin coniferous concentrate is placed on the column with silica gel and successively washed with ethyl alcohol with concentration of 82-85 vol. % and acetone, and the acetone fraction then undergoes hydrolysis and column chromatography.
EFFECT: simplification of the method.
4 ex
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