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. 2020 Dec 16;25(24):5964. doi: 10.3390/molecules25245964

Figure 27.

Figure 27

The pH-dependent photophysical properties of the new dye; (a) Absorption and (c) fluorescence with pH and the resulting pKa titration curves (b,d); (e) Proposed closed–open equilibrium of the spirolactone. Adapted with permission from [296].