Methylation of 4 and 5 Followed by Methanolysis. A mixture of 4 (or 5) (each 1 mg), Me2SO4 (10 µL), and K2CO3 (10 mg) in dry acetone (1 mL) was stirred overnight at room temperature and then heated under reflux for 2 h. After removal of inorganic material by centrifugation, the reaction mixture was directly methanolyzed in 2% NaOMe in MeOH (1 mL) at room temperature for 8 h. The reaction mixture was evaporated in vacuo. Reversed-phase HPLC (solvent D) of each residue showed peaks identical with those of the authentic compounds 9, 10, and 11.