[OH:1][CH2:2][CH2:3][CH2:4][NH:5][C:6]1[CH:11]=[C:10]([CH3:12])[N:9]=[C:8]2[CH:13]=[N:14][NH:15][C:7]=12.[C:16](Cl)(=[O:18])[CH3:17].[OH-].[Na+]>O>[C:16]([O:1][CH2:2][CH2:3][CH2:4][NH:5][C:6]1[CH:11]=[C:10]([CH3:12])[N:9]=[C:8]2[CH:13]=[N:14][NH:15][C:7]=12)(=[O:18])[CH3:17]The title compound was prepared from 7(3-hydroxypropylamino)-5-methyl-1H-pyrazolo[4,3-b]pyridine (1.125 g) and acetyl chloride by the general method of Example 4 with the following addition. After removal of solvents under reduced pressure the crude reaction mixture was dissolved in water and brought to pH 9 with 10% sodium hydroxide. The resulting solid was collected and dried before purifying by column chromatography under the conditions used for Example 4. A clear gum was obtained which on trituration with ether gave the title compound as a white solid, m.p. 115°-119° C.
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