[ClH:1].[CH3:2][O:3][C:4]1[CH:5]=[C:6](/[CH:12]=[C:13](/[C:16]2[CH:17]=[N:18][CH:19]=[CH:20][CH:21]=2)\[C:14]#[N:15])[CH:7]=[CH:8][C:9]=1[O:10][CH3:11]>>[ClH:1].[CH3:2][O:3][C:4]1[CH:5]=[C:6](/[CH:12]=[C:13](/[C:16]2[CH:17]=[N:18][CH:19]=[CH:20][CH:21]=2)\[C:14]#[N:15])[CH:7]=[CH:8][C:9]=1[O:10][CH3:11]0.1N Hydrochloric acid (8.3 mL) was added to Compound 44 (200 mg) for dissolution, and purified water (5 mL) was added to the solution, followed by stirring at room temperature for 20 minutes. The reaction mixture was lyophilized, to thereby yield the target product (yield: 224 mg, 99%).
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