3.1. Enzymatic hydrolysis of 25Seven milligrams of crude hesperidinase were added to an aqueous solution of 25 (11 mg). The mixture was incubated at37 C for 72 h. The solution was extracted with EtOAc to afford the aglycone 25a, 4.2 mg, [a] 32.4 (0.19, MeOH). Theremaining aqueous solution was evaporated and purified with silica gel CC (solvent system: CH2Cl2:MeOH:H2O) to giveD-glucose as identified by comparison with the chromatogram of the authentic sample in HPLC equipped with an opticalrotation detector.