(6R,7S)-7α-[[(R)-5-Amino-5-carboxy-1-oxopentyl]amino]-3-[[[3-(4-hydroxyphenyl)-2-methoxy-1-oxo-2-propenyl]oxy]methyl]-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
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(6R,7S)-7α-[[(R)-5-Amino-5-carboxy-1-oxopentyl]amino]-3-[[[3-(4-hydroxyphenyl)-2-methoxy-1-oxo-2-propenyl]oxy]methyl]-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid;Cephamycin B
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