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. Author manuscript; available in PMC: 2014 Jun 5.
Published in final edited form as: J Am Chem Soc. 2013 May 23;135(22):8153–8156. doi: 10.1021/ja403441x

Scheme 3.

Scheme 3

Possible reaction outcomes of HppE with substrate analogues bearing electron-withdrawing (A) and/or leaving groups at C3 (B). (C) List of mechanistic probes used in this study.