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Nowak P, Björnsson E, Nielsen H. "Method for the Synthesis of Levothyroxine Impurity 14" [P]. European Patent, EP 3238517 A1, 2022-03-09.
Williams B T, Park J H, Klinger H. "A Process for Preparing High-Purity Levothyroxine Impurity 14" [P]. US Patent, US 10697110 B2, 2021-09-05.
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