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The synthesis and determination of the antioxidant activity of some novel (5,7-dimethyl-2-oxo-thiazolo[4,5- b ]pyridine-3-yl)-acetic acid hydrazide derivatives are described in this article. The transformation of the base heterocycle was carried out via the reactions of acylation, [2+3]cyclocondensation, Knoevenagel condencation and alkylation for the purpose to obtain substances with a satisfactory pharmacological profile. Antioxidant activity of the synthesized compounds was evaluated  in vitro  by means of the scavenging metod effect on 2,2 diphenyl-1-picrylhydrazyl ( DPPH ) radicals.

Antioxidant properties of some novel derivatives thiazolo[4,5- b ] pyridine