CN(C)[CH:3]=[O:4].[C:6](=[O:9])([O-])[O-].[K+].[K+].Br[CH2:13][C:14](OC)=[O:15].[C:18]1([OH:34])[C:28]2[CH2:27][CH2:26][C:25]3[CH:29]=[CH:30][CH:31]=[CH:32][C:24]=3[O:23][C:22]=2[CH:21]=[C:20](O)[CH:19]=1>CCCCCC>[OH:15][CH2:14][CH2:13][O:34][C:18]1[C:28]2[CH2:27][CH2:26][C:25]3[CH:29]=[CH:30][CH:31]=[CH:32][C:24]=3[O:23][C:22]=2[CH:21]=[C:20]([O:9][CH2:6][CH2:3][OH:4])[CH:19]=1
N,N-Dimethylformamide (0.6 ml), potassium carbonate (90 mg) and methyl bromoacetate (51 μl) were added to 50 mg of the Compound 12 recovered in the Production Example 12, and the resulting mixture was stirred at room temperature for 2 hours. The reaction solution was partitioned between ethyl acetate and dilute hydrochloric acid, and the resulting ethyl acetate layer was washed in water and then in an aqueous saturated sodium chloride solution and dried over anhydrous magnesium sulfate, followed by distilling off the solvent under reduced pressure. To the residue was added anhydrous diethyl ether of 0.5 ml, for stirring at 0° C. Then, LiAlH4 (20 mg) was added to the resulting mixture, followed by stirring at room temperature for 2 hours. To the resulting mixture were added trace amounts of ethyl acetate and an aqueous saturated sodium chloride solution, followed by filtration and evaporation of the solvent under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent; ethyl acetate:hexane=1:2), followed by recrystallization in ethyl acetate and hexane, to recover the entitled Compound 56 (40 mg; yield of 58%) as colorless needles, represented by the following formula. The melting point of the Compound 56 was 111.5-113.5° C.
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