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- [3] SIMPLE AND CONDENSED BETA-LACTAMS .8. THE PREPARATION AND REACTIONS OF SOME 4-OXOAZETIDIN-2-YLACETIC ACID-DERIVATIVES, AND A SYNTHESIS OF PARA-NITROBENZYL (5RS,6SR)-2-(2-FORMYLAMINOETHYLTHIO)-6-(2-METHYL-1,3-DIOXOLAN-2-YL)-CARBAPEN-2-EM-3-CARBOXYLATE, A COMPOUND RELATED TO THE ANTIBIOTIC THIENAMYCINH JOURNAL OF CHEMICAL RESEARCH-S, 1987, (02): : 28 - 29