FIELD: therapy. SUBSTANCE: claimed method comprises reacting iminostilbene with alkaline cyanate in acetic acid, in acetic acid-water or acetic acid-alcohol mixtures. Acetic acid-water mixture comprises up to 20 wt % and acetic acid-alcohol comprises up to 10 wt % methanol or ethanol. Alkaline cyanate such as sodium or potassium cyanate in the form of aqueous solution is added gradually to reaction mixture. The claimed method makes it possible to simplify process. EFFECT: more efficient preparation method. 7 cl, 7 ex
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