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Time course of the photolysis at 22 °C and pH 3.5 of peptide 1a and its transformation into 2 (m/z 570.3, ♦), 3 (m/z 572.3, ○), 4 (m/z 584.3, ■), 5 (m/z 586.3, ▲) and 6 (m/z 604.3, ●).