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Schröder R, Johnson M A, Anderson J P. "A Process for Preparing High-Purity (2S,6S)-6-Bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (Sulbactam Impurity)" [P]. US Patent, US 11372249 B2, 2024-04-16.
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