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Sørensen M, Nowak P, Mueller T C. "A Process for Preparing High-Purity tert-Butyl (S)-(2-oxo-1,2,3,4-tetrahydropyrido[3,4-b][1,4]oxazepin-3-yl)carbamate" [P]. European Patent, EP 3412214 A1, 2015-11-17.
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