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Chemical structures of plant-derived secondary metabolites interacting with solar irradiation. 1–4, photosensitizers which absorb solar light energy and transform it into energy of chemical/biochemical reactions (anoxic type I or oxygen-dependent type II). 5–10, substances with mainly photoprotective (sunscreen) properties which absorb solar light energy and dissipate it in the forms of thermal, fluorescence/phosphorescence, or oscillation energy.
