Sodium Hydroxide → (4'-{1-ethyl-1-[4-(4-hydroxy-tetrahydro-pyran-4-ylethynyl)-3-methyl-phenyl]-propyl}-2'-methyl-biphenyl-4-yl)-acetic Acid

A 1 N sodium hydroxide aqueous solution (0.197 mL, 0.197 mmol) was added to a solution of (4′-{1-ethyl-1-[4-(4-hydroxy-tetrahydro-pyran-4-ylethynyl)-3-methyl-phenyl]-propyl}-2′-methyl-biphenyl-4-yl)-acetic acid methyl ester (Example 130-(6); 34.4 mg, 0.066 mmol) in methanol-tetrahydrofuran (1:1, 2 mL), and the mixture was stirred at room temperature overnight. Then, the reaction mixture was concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (ethyl acetate:methanol:water=4:1:0.3) to give the target compound as a colorless oil (32.1 mg, 95%).