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?? ???? >(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ??
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(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid C??? ??, ??, ??
(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ?? ? ???
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(4R,5β)-3-[[(3S)-5β-[Hydroxymethyl]pyrrolidin-3-yl]thio]-6β-[(R)-1-hydroxyethyl]-4α-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ??
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