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Changes of the absorption spectra during the irradiation of 2c for 13 min (A), 2d for 12 min (B), 2e for 15 min (C), 2f for 10 min (D), and 2g for 7 min (E) (in MeCN, c = 20 µM, λex > 220 nm, irradiated in a cuvette). Blue: spectrum of the starting material before irradiation; red: spectrum at the end of the irradiation.
