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. Author manuscript; available in PMC: 2020 Sep 25.
Published in final edited form as: J Am Chem Soc. 2019 Sep 11;141(38):15250–15265. doi: 10.1021/jacs.9b07152

Figure 4.

Figure 4.

Analogues of the GFP model chromophore, 4-hydroxybenzylidene-1,2-dimethylimidazolinone (HBDI), synthesized and characterized in this study. Note that the orientations of the substituents are not known for the singly substituted model chromophores.