pivaloyloxymethyl 6-(1-hydroxyethyl)-1-methyl-2-(5-oxopyrrolidin-3-ylthio)-1-carbapen-2-em-3-carboxylate
pivaloyloxymethyl 6-(1-hydroxyethyl)-1-methyl-2-(5-oxopyrrolidin-3-ylthio)-1-carbapen-2-em-3-carboxylate