(6R,7R)-7-({(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-[(carboxymethoxy)imino]acetyl}amino)-3-{[(1-methylpyridinium-4-yl)sulfanyl]methyl}-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
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