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?? ???? >(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ??
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(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid C??? ??, ??, ??
(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ?? ? ???
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(5S)-6β-[(R)-1-Hydroxyethyl]-3-[[2-amino-3-pyridyl]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ??
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