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Nielsen H, Rossi M, Johansson L. "A Process for Preparing High-Purity 2-[6-(2-methoxyphenyl)-3-methyl-4-(trifluoromethyl)-1h-pyrazolo[3,4-b]pyridin-1-yl]acetic acid" [P]. European Patent, EP 3777438 A1, 2019-10-02.
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