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Hughes D C, Chen K W, Patel M V. "A Process for Preparing High-Purity 1-Cyclopropyl-6-fluoro-4-oxo-7-(1H-pyrrol-1-yl)-1,4-dihydroquinoline-3-carboxylic acid" [P]. US Patent, US 11351478 B2, 2021-04-19.
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