p-Nitrobenzyl-6-(1-hydroxyethyl)-1-azabicyclo(3.2.0)heptane-3,7-dione-2-carboxylate
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[5R-α,6α(R*)]]-6-(1-hydroxyethyl)-3-[[2-[[[[[(4nitrophenyl) methoxy]carbonyl]amino]methylene]amino]ethyl]thio]-7-oxo-1-azabicyclo[3,2,0]hept-2-ene-2-carboxylic acid, (4-nitrophenyl)methyl ester  (CAS:98367-45-4)