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Process for the preparation of sodium (2R,5S,13AR)-7,9-dioxo-10-((2,4,6-trifluorobenzyl) carbamoyl)-2,3,4,5,7,9,13,13A-octahydro-2,5-Methanopyrido[1 ′,2′:4,5]pyrazino[2,1 -b] [1,3] oxazepin-8-olate and its polymorphic form

US Patent 11623933 · Granted Apr 11, 2023

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