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p. 1996 - 2000
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4-[3-(p-nitrobenzyloxycarbonyl)-2-oxopropyl]-azetidin-2-one
p-nitrobenzyl 4-(2-azetidinon-4-yl)-2-butenoate
p-nitrobenzyl 4-(2-azetidinon-4-yl)-3-butenoate
4-acetoxy azetidinone
trimethylsilyl trifluoromethanesulfonate
p-nitrobenzyl 2-oxocarbapenam-3-carboxylate
3-(Diphenoxy-phosphoryloxy)-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester
p-nitrobenzyl 2-benzylthiocarbapen-2-em-3-carboxylate
potassium 2-benzylthiocarbapen-2-em-3-carboxylate
p-nitrobenzyl (3RS,5RS)-2-oxocarbapenam-3-carboxylate