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?? ???? >(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ??
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(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid C??? ??, ??, ??
(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ?? ? ???
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(5R)-3-[[(E)-2-(Acetylamino)ethenyl]thio]-6β-isopropyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?? ??
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