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. Author manuscript; available in PMC: 2014 Jun 11.
Published in final edited form as: Biochemistry. 2013 May 30;52(23):4097–4104. doi: 10.1021/bi400177y

Scheme 4.

Scheme 4

BlaC acylation of nitrocefin, cefoxitin, and meropenem. Pyrroline ring isomerization of meropenem results in the incorporation of a solvent exchangeable proton (red) at C3.