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. Author manuscript; available in PMC: 2022 Jun 18.
Published in final edited form as: Tetrahedron. 2021 May 8;90:132190. doi: 10.1016/j.tet.2021.132190

Figure 1.

Figure 1.

A. Utility of glutamine derivatives (e.g., 2) and the current gap in knowledge for direct functionalization of glutamine (1). B. Representative examples of nonribosomal peptide natural products with hydroxylated glutamine motif.