[Cl:1][C:2]1[CH:3]=[C:4]([C:12]2[O:16][N:15]=[C:14]([C:17]3[CH:35]=[CH:34][C:20]4[CH2:21][CH2:22][N:23]([CH2:26][CH2:27][CH2:28][C:29]([O:31]CC)=[O:30])[CH2:24][CH2:25][C:19]=4[CH:18]=3)[N:13]=2)[CH:5]=[N:6][C:7]=1[O:8][CH:9]([CH3:11])[CH3:10].[OH-].[Na+].C(O)(=O)C>C(O)C>[Cl:1][C:2]1[CH:3]=[C:4]([C:12]2[O:16][N:15]=[C:14]([C:17]3[CH:35]=[CH:34][C:20]4[CH2:21][CH2:22][N:23]([CH2:26][CH2:27][CH2:28][C:29]([OH:31])=[O:30])[CH2:24][CH2:25][C:19]=4[CH:18]=3)[N:13]=2)[CH:5]=[N:6][C:7]=1[O:8][CH:9]([CH3:10])[CH3:11]A suspension of ethyl 4-[7-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl]butanoate (Preparation 97) (185 mg, 0.371 mmol) in ethanol (3 ml), was treated with 2M sodium hydroxide (0.556 ml, 1.11 mmol) at room temperature overnight to give a colourless precipitate. A further 1-2 mls of ethanol was added and the temperature was raised to 50° C. to complete the reaction. Acetic acid (0.07 ml, 1.22 mmol) was added to the solution and the mixture concentrated. The resultant oily residue was treated with water (ca 3 ml) then stirred at room temperature for 1-2 hr and filtered. The solid was washed with water, then dissolved in methanol and the solvent evaporated. The resultant solid was dried overnight in vacuo at ca 60° C. to give the title compound (153 mgs).
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