[N:1]([C:4]1[CH:9]=[CH:8][C:7]([N:10]2[CH2:14][C@H:13]([CH2:15][NH:16][C:17](=[O:19])[CH3:18])[O:12][C:11]2=[O:20])=[CH:6][C:5]=1[F:21])=[N+:2]=[N-:3].[BH4-].[Na+].[CH2:24]1[CH2:28]O[CH2:26][CH2:25]1.C[OH:30]>>[F:21][C:5]1[CH:6]=[C:7]([N:10]2[CH2:14][C@H:13]([CH2:15][NH:16][C:17](=[O:19])[CH3:18])[O:12][C:11]2=[O:20])[CH:8]=[CH:9][C:4]=1[N:1]1[CH:26]=[C:25]([CH:24]([OH:30])[CH3:28])[N:3]=[N:2]1A solution of 150 mg (0.40 mmol) of the compound of Example 17 in 10 mL 1:1 THF-methanol was treated with 15 mg (0.4 mmol) of sodium borohydride followed by stirring at ambient temperature for 18 h. The mixture was concentrated in vacuo, dissolved in 1:1 methanol-dichloromethane and filtered. The filtrate was concentrated in vacuo and the residue was subjected to radial chromatography on a 2 mm chromatotron plate. These procedures afforded 120 mg (80%) of the title compound as a white solid. Mass Spectrum (EI): m/z 363, 291, 276, 232, 217, 207, 191, 179, 163, 148, 135, 123, 85, 56.
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