(4r,5s,6s)-p-nitrobenzyl 3-<(3s,5s)-(5-dimethylaminocarbonyl-1-p-nitrobenzyloxycarbonyl)pyrrolidin-3-yl>-6-<(1r)-1-hydroxyethyl>-4-methyl-7-oxo-1-azabicyclo<3.2.0>hept-2-ene-2-carboxylate
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