1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid, 3-[(diphenoxyphosphinyl)oxy]-6-(1-hydroxyethyl)-7-oxo-,(4-nitrophenyl)methyl ester, [5R-[5a,6a(R*)]]-;p-Nitrobenzyl(5R,6S)-2-(diphenylphosphoryloxy)-6-((1R)-1-hydroxyethyl)carbapen-2-em-3-carboxylate;
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