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Davis P L, Brown S R, Schröder R. "A Process for Preparing High-Purity (E)-4-((3-cyano-6-methyl-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-oxobut-2-enoic acid" [P]. US Patent, US 9553258 B2, 2023-10-22.
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