[N:1]1[CH:6]=[CH:5][CH:4]=[N:3][C:2]=1[N:7]1[CH2:16][CH2:15][C:14]2[C:9](=[C:10]([C:17]([O:19]C)=[O:18])[CH:11]=[CH:12][CH:13]=2)[CH2:8]1.[OH-].[Na+].Cl>C1COCC1>[N:1]1[CH:6]=[CH:5][CH:4]=[N:3][C:2]=1[N:7]1[CH2:16][CH2:15][C:14]2[C:9](=[C:10]([C:17]([OH:19])=[O:18])[CH:11]=[CH:12][CH:13]=2)[CH2:8]1Compound 9u (187 mg, 0.44 mmol) was refluxed with 3N aqueous NaOH (0.25 mL mg, 0.75 mmol) in THF (6 mL) overnight. Concentrated HCl solution was added to the mixture to adjust pH to 3˜4. The resulting mixture was concentrated to give 9v (350 mg) as the tris-HCl salt.
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