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Hypericin hydroquinone is the product of two-electron reduction of hypericin (quinone), a potent phenanthroperylenequinone photosensitizer. In contrast to the quinone, the hydroquinone exhibits strong absorbance in the far-red spectral region. Herein we provide initial evidence on the potential of hypericin hydroquinone as a far-red photosensitizer.
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Theodossiou et al. (2009) studied this question.
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