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Johansson L, Kowalski A, Martínez F. "A Process for Preparing High-Purity Tert-butyl (S)-2-(7-oxo-2-oxa-5,8-diazaspiro[3.5]Nonan-6-yl)acetate" [P]. European Patent, EP 3841042 A1, 2020-12-16.
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