FIELD: chemistry of biologically active compounds, medicine. SUBSTANCE: bacteriochlorophyll a is extracted with dioxane followed by conversion of pigment in petroleum ether. The end product is separated by decrease of dioxane concentration in petroleum ether. The end product is purified by reprecipitation of bacteriochlorophyll a from chlorinated hydrocarbon with saturated hydrocarbons. Invention is used in photodynamic therapy of cancer. EFFECT: increased yield of the end product, decreased cost. 4 ex
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