(2Ξ)-2-[[(E)-[2-[(R)-[(4-ethyl-2,3-dioxopiperazine-1-carboxamido)phenylmethyl]-5-oxo-1,3-oxazol-4(5H)-ylidene]methyl]amino]-3-methyl-3-sulfanylbutanoic acid (penicillenic acid) (as per EP); Piperacillin Impurity 14
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