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Photobleaching of PPIX-MED. Photostability of PPIX-MED with irradiation time (2 × 10– 5 mol/l PPIX-MED, 0.2 J/cm2 per min). (A) The absorption spectrum of compound PPIX-MED from 0 to 30 min. (B) The absorbance change of compound PPIX-MED against irradiation time at the maximum absorption wavelength.
