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Mass spectra (electrospray ionization (ESI), positive mode) of prodrug 5 (40 μM in N,N-dimethylformamide DMF/CH3CN/H2O, 1/10/90, v/v/v) kept at 22 °C for 5 min in presence of H2O2 (35 mM, inset A) and in its absence (inset B). More detailed information (e.g., zoomed in spectra) is provided in the SI (Figure S15).
