(2R)-[(3S)-3-{[(2E)-2-(hydroxyimino)-2-(4-hydroxyphenyl)acetyl]amino}-2-oxoazetidin-1-yl](4-hydroxyphenyl)ethanoic acid;(2R)-[(3S)-3-{[(2Z)-2-(hydroxyimino)-2-(4-hydroxyphenyl)acetyl]amino}-2-oxoazetidin-1-yl](4-hydroxyphenyl)ethanoic acid
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