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Avibactam Impurity 7 Oxalate Avibactam Impurity 1 Oxalate Avibactam Impurity 30 Oxalate Avibactam Impurity 33（2R,5R）Oxalate (2S, 5S) -benzyloxyaminopiperidine-2-carboxylic acid ethyl sulfate salt 2-Piperidinecarboxylic acid, 5-[(phenylmethoxy)amino]-, ethyl ester, ethanedioate (1:1), (2S,5S)-