FIELD: medicine. SUBSTANCE: diketene-imine derivatives having formula (I) is used as reagent 1, methylamine being used as reagent 2. Their interaction is carried out in the medium of solvent at room temperature. Methylamine is used in gaseous state or in aqueous solution, preferred quality of said solution being 10 moles of 40 mass % solution. EFFECT: improves efficiency of the method. 3 cl
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