Methylation of 2 and 3 Followed by Methanolysis. Methylation of 2 and 3 (each 1 mg) was performed in a way similar to that described for 1. Each reaction mixture was directly methanolyzed in 2% NaOMe in MeOH (1 mL) at room temperature for 8 h. After the usual workup, the reaction mixtures obtained from the individual tannins were analyzed by reversed-phase HPLC (solvent D) to detect common peaks identical with those of authentic compound 10 and dimethyl hexamethoxydiphenate (11).