C(OC(=O)C)C.[ClH:7].[NH2:8][CH2:9][CH2:10][CH2:11][O:12][C:13]1[CH:30]=[CH:29][C:16]2[N:17]([CH2:27][CH3:28])[C:18](=[O:26])[C:19]([CH3:25])([CH3:24])[C:20](=[O:23])[N:21]([CH3:22])[C:15]=2[CH:14]=1>C(OCC)(=O)C>[ClH:7].[NH2:8][CH2:9][CH2:10][CH2:11][O:12][C:13]1[CH:30]=[CH:29][C:16]2[N:17]([CH2:27][CH3:28])[C:18](=[O:26])[C:19]([CH3:24])([CH3:25])[C:20](=[O:23])[N:21]([CH3:22])[C:15]=2[CH:14]=1A 4N-hydrogen chloride ethyl acetate solution (0.42 ml) was added to an ethyl acetate solution (3 ml) of 7-(3-aminopropoxy)-1-ethyl-3,3,5-trimethyl-1,5-dihydrobenzo[b][1, 4]diazepine-2,4-dione (264 mg), and stirred at room temperature for 30 minutes. The reaction mixture was concentrated to dryness under reduced pressure to thereby obtain 0.22 g of 7-(3-aminopropoxy)-1-ethyl-3,3,5-trimethyl-1,5-dihydrobenzo[b][1, 4]diazepine-2,4-dione hydrochloride as a white amorphous solid.
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