FIELD: organic chemistry, pharmacy. SUBSTANCE: invention relates to a novel derivative of benzothiazolone of the formula (I) and (II) where X means naphthyl and its pharmaceutically acceptable salts. Method of synthesis of compound of the formula (I) involves selective reduction of compound of the formula (II). Compounds of the formula (I) can be used for synthesis of medicinal agent for treatment of patients with diseases or respiratory ways, for example, asthma and chronic bronchitis. EFFECT: synthesis of new derivative of benzothiazolone, valuable medicinal properties. 8 cl, 1 tbl, 1 ex
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