To a solution of 4-[(4-{3-[1-carboxy-1-(methyl)ethyl-carbamoyl]propoxy}-2-methylphenyl)methyl]-5-isopropyl-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyloxy)-1H-pyrazole (40 mg) in N,N-dimethylformamide (2 mL) were added 1-(2-hydroxyethyl)piperazine (7 mg), 1-hydroxybenzotriazole (7 mg), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (13 mg) and triethylamine (0.018 mL), and the mixture was stirred at room temperature overnight. The reaction mixture was poured into water, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: dichloro-methane/methanol=15/1) to give 4-[(4-{3-[1-{[4-(2-hydroxyethyl)piperazin-1-yl]carbonyl}-1-(methyl)ethyl-carbamoyl]propoxy}-2-methylphenyl)methyl]-5-isopropyl-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyloxy)-1H-pyrazole (27 mg). This material was dissolved in methanol (2 mL). To the solution was added sodium methoxide (28% methanol solution, 0.015 mL), and the mixture was stirred at 50° C. overnight. The reaction mixture was concentrated under reduced pressure, and the residue was purified by solid phase extraction on ODS (washing solvent: distilled water, eluent: methanol) to give the title compound (12 mg).
