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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Top Curr Chem (Cham). 2016 May 9;374(3):30. doi: 10.1007/s41061-016-0030-6

Figure 16.

Figure 16

A mechanistic example of a hydrogen-bond relay, capable of transferring a proton to the pyridyl nitrogen while simultaneously removing a proton from the phenoxyl oxygen.