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Detection by mass spectrometry of the photoproducts generated after UV-irradiation at 253.7 nm of peptide 1a (400 µM) in Ar-saturated H2O solution at pH 7.5 and followed by the addition of 100 mM of β-mercaptoethanol. The photoproducts observed are the following: 3 (m/z 572.3), 5 (m/z 586.3), 6 (m/z 604.3), 2β (m/z 648.4), 4β (m/z 662.4), 5β (m/z 664.4), 6β (m/z 680.4), 7β (m/z 678.4), 8β (m/z 724.4), and 9β (m/z 756.3):
