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. Author manuscript; available in PMC: 2020 Sep 20.
Published in final edited form as: J Org Chem. 2019 Sep 5;84(18):11856–11862. doi: 10.1021/acs.joc.9b01708

Figure 7.

Figure 7.

Conformations studied via quantum-mechanical calculations for protonated and deprotonated states. C1 represents the lowest energy, hydrogen bonded conformation, whereas C2 represents conformation with 180° rotation about the 5-6 bond.