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Inspection of mass spectra obtained from XIC m/z 217-218 (calcd. [M-H]- = 217.1) and 199-200 (calcd. [M-H]- = 199.1) for 19, 20 and 21 during the hydrolysis of 1 (at t = 2 d) in the presence of GSH and HLE at pH 6.2 and 37 °C. Chromatographic conditions: A mixture of water and MeCN containing 0.1% formic acid (linear gradient from 1% up to 50.0% MeCN in 35 min).
