[CH2:1]1[O:11][C:10]2[C:3](=[C:4]([CH:7]=[CH:8][CH:9]=2)[CH:5]=[O:6])[O:2]1.[OH-:12].[K+]>CCO.O.[N+]([O-])([O-])=O.[Ag+]>[CH2:1]1[O:11][C:10]2[C:3](=[C:4]([CH:7]=[CH:8][CH:9]=2)[C:5]([OH:12])=[O:6])[O:2]1To a solution of 0.85 g (5.66 mmol) of 2,3-methylenedioxybenzaldehyde (Aldrich) in EtOH at 0° C. was added a solution of 2.12 g (12.45 mmol) of AgNO3 in 7.5 mL of H2O. To this was then added a solution of 1.74 g (31.4 mmol) of KOH in 12 mL of H2O. After 2 h, the reaction mixture was filtered and the filter was washed with EtOH. The filtrate was concentrated and the pH was adjusted to pH=2 to 3 with 6N HCl. The title compound precipitated out and was isolated by filtration to give the title compound. 1H NMR (CDCl3) δ6.16 (s, 2H), 6.92 (t, 1H, J=8 Hz), 7.04 (d, 1H, J=8 Hz), 7.48 (d, 1H, J=8 Hz);
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