Compound (40) 242 mg was dissolved in methanol 4 ml and 5% palladium/C 60 mg was added. A mixture was stirred in hydrogen atmosphere at room temperature for 3 h. The catalyst was filtered off and the filtrate was concentrated under reduced pressure. The residue obtained was chromatographed on aluminum oxide in ethyl acetate:hexane (1:2) to give the titled compound as colorless crystals 241.6 mg. Yield 99%. This was recrystallized from acetone-hexane to give the titled compound as colorless crystals, m.p. 91-92° C.
