ChemInform Abstract: Simple and Condensed β-Lactams. Part 4. Synthesis of Some 1-(o- and p-Nitrophenyl)- and 1-(p-Aminophenyl)-2-azetidinones and Derivatives of the 2,2a,3,4-Tetrahydro-1H-azeto[1,2-a]quinoxaline Ring System.

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