FIELD: medicine. SUBSTANCE: present invention describes compounds of formula (I): 
wherein Ro is hydrogen atom, methyl or hydroxymethyl; R1 is substituted alkyl; each of R2 and R3 is hydrogen or halogen atom, hydroxy, alkoxy, carboxy group, alkoxycarbonyl, alkyl, nitro group, haloalkyl or substituted alkyl; X is oxygen or sulfur atom, and as is optionally substituted phenyl or naphthyl, and pharmaceutically acceptable salts thereof have different useful activities including antidiabetic activity and antiobesity activity. Besides, they are suitable for treatment and prophylaxis of hyperlipemia and hyperglykemia; they are effective in treatment and prophylaxis of diabetes complications. EFFECT: improved properties of the title compounds. 46 cl, 10 tbl
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