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MALDI-TOF-MS traces for 1a (left) and 2a (right) obtained to determine their stability under relatively harsh conditions: top traces were obtained from samples immediately after hydrolysis of the corresponding ester precursors; middle traces were obtained after storage in 4M HCl and bottom traces were obtained after storage in 5M NaOH (signals in the bottom traces separated by an m/z of 22 result from species with multiple sodium counterions).
