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Johnson M A, Brown S R, Patel M V. "Method for the Synthesis of Febuxostat Impurity 38" [P]. US Patent, US 9684577 B2, 2019-12-03.
Kowalski A, Martínez F, Björnsson E. "A Process for Preparing High-Purity Febuxostat Impurity 38" [P]. European Patent, EP 3462307 A1, 2016-04-25.
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