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Derivatization reaction progress monitored by HPLC. Step 1: oxidation after MnO2 addition at 0, 15 and 30 min (Fig. 3a, b and c, respectively). IVM peak (A) was gradually decreasing while a second peak corresponding to H2B1a -5-one (B) increased. Step 2: dehydration and tautomerization at 0, 15 and 30 min (Fig. 3d, e and f, respectively).
