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Lee S K, Hughes D C, Park J H. "A Process for Preparing High-Purity 5-Chloro-1-(4-chlorobenzyl)-N-(2-(dimethylamino)ethyl)-2-oxo-1,2-dihydropyridine-3-carboxamide" [P]. US Patent, US 11587279 B2, 2018-08-13.
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