The conformation of the β-lactam ring can be influenced by the presence of substituents, which can affect the accessibility of the amide nitrogen and the stability of intermediates.
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2-Azetidinone, 1-(2-hydroxyethyl)-4-[[(phenylmethoxy)methoxy]methyl]-
3-Cyclobutene-1,2-dione, 3,4-bis(4-nitrophenoxy)-
