[CH2:1]([N:4]([CH2:29][CH2:30][CH3:31])[CH2:5][CH2:6][CH2:7][CH2:8][NH:9][C:10]([C:12]1[N:13]=[C:14]2[CH2:19][CH2:18][CH:17]([CH2:20][NH:21][CH2:22][C:23]3[NH:24][CH:25]=[CH:26][N:27]=3)[CH2:16][N:15]2[CH:28]=1)=[O:11])[CH2:2][CH3:3].[CH3:32][N:33]1[CH:37]=[CH:36][N:35]=[C:34]1[CH:38]=O.C([BH3-])#N.[Na+].C(=O)([O-])O.[Na+]>CO.C(O)(=O)C>[CH2:29]([N:4]([CH2:1][CH2:2][CH3:3])[CH2:5][CH2:6][CH2:7][CH2:8][NH:9][C:10]([C:12]1[N:13]=[C:14]2[CH2:19][CH2:18][CH:17]([CH2:20][N:21]([CH2:22][C:23]3[NH:24][CH:25]=[CH:26][N:27]=3)[CH2:38][C:34]3[N:33]([CH3:32])[CH:37]=[CH:36][N:35]=3)[CH2:16][N:15]2[CH:28]=1)=[O:11])[CH2:30][CH3:31]The compound (19.6 mg) obtained in Example 19-4 was dissolved in methanol (2.0 ml) and added with 1-methyl-2-imidazole carboxaldehyde (6.2 mg) and sodium cyanoborohydride (5.9 mg). The solution was adjusted to pH 4 with acetic acid and stirred at room temperature for 3 hours. The resultant was added with a saturated sodium hydrogen carbonate aqueous solution to stop the reaction and subjected to extraction with chloroform. The organic layer was washed with water and a saturated saline solution and dried with anhydrous sodium sulfate. The solvent was distilled off. The residue was purified through silica gel column chromatography (chloroform/ethyl acetate) and treated with hydrochloric acid, thereby obtaining a hydrochloride (22.0 mg) of the subject compound as a white solid.
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