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Synthesis of XXXG-β-Res. Reagents and conditions are as follows. (i) a, Cellulase from T. reesei, buffer pH 5.0, 40°C 1 h, then β-galactosidase from Aspergillus niger, 20 h. b, Ac2O/pyridine, 60°C, 18 h. (ii) a, HBr/AcOH/CH2Cl2; 0°C, 3 h. b, Resorufin sodium salt, BuBn3N(Cl)/CH2Cl2/H2O, room temperature 20 h. c, NaOMe/MeOH, room temperature 1 h.
