[OH:1][C:2]1[CH:3]=[C:4]([CH:12]=[C:13]([CH3:17])[C:14](=[O:16])[CH3:15])[CH:5]=[C:6]([N+:9]([O-:11])=[O:10])[C:7]=1[OH:8].[BH4-].[Na+].O.Cl>[OH-].[Na+]>[OH:1][C:2]1[CH:3]=[C:4]([CH:12]=[C:13]([CH3:17])[CH:14]([OH:16])[CH3:15])[CH:5]=[C:6]([N+:9]([O-:11])=[O:10])[C:7]=1[OH:8]1.8 g of the product obtained in Example 6 was dissolved in 20 ml of 1N NaOH-solution and 4.0 g of sodium borohydride in small amount of water was added. The mixture was stirred over night at room temperature, acidified with hydrochloric acid and extracted with ether. The solvent was evaporated in vacuo and the residue purified in a silica gel column by using toluene-acetic acid dioxane (18:1:1). The product was crystallized from dichloromethane petroleum ether. Yield 0.80 g (44%), m.p. 102°-104° C.
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