[NH:1]1[CH:5]=[CH:4][N:3]=[C:2]1[CH2:6][NH:7][CH2:8][C:9]1[CH:10]=[CH:11][C:12]2[N:16]=[C:15]([CH2:17][CH2:18][CH2:19][CH2:20][N:21]([CH2:25][CH2:26][CH3:27])[CH2:22][CH2:23][CH3:24])[N:14]([CH2:28][CH2:29][CH3:30])[C:13]=2[CH:31]=1.C(O)(=O)C.[CH3:36][N:37]1[CH:41]=[CH:40][N:39]=[C:38]1[CH:42]=O.C([BH3-])#N.[Na+]>CO>[NH:3]1[CH:4]=[CH:5][N:1]=[C:2]1[CH2:6][N:7]([CH2:8][C:9]1[CH:10]=[CH:11][C:12]2[N:16]=[C:15]([CH2:17][CH2:18][CH2:19][CH2:20][N:21]([CH2:22][CH2:23][CH3:24])[CH2:25][CH2:26][CH3:27])[N:14]([CH2:28][CH2:29][CH3:30])[C:13]=2[CH:31]=1)[CH2:42][C:38]1[N:37]([CH3:36])[CH:41]=[CH:40][N:39]=1The compound (64.0 mg) obtained in Example 4-1 was dissolved in methanol (1.3 ml) and added with acetic acid (0.065 ml) and 1-methyl-2-imidazole carboxaldehyde (16.6 mg) and the whole was cooled to 0° C. Then, the solution was added with sodium cyanoborohydride (14.2 mg) and stirred at room temperature for 2 days. After completion of the reaction, the solvent was distilled off under reduced pressure and the residue was then dissolved in chloroform. After washing with a 1 mol/l sodium hydroxide aqueous solution, the solution was subjected to extraction with chloroform. The organic layer was washed with a saturated saline solution and dried with anhydrous sodium sulfate.
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