[CH:1]([NH:4][C:5]([N:7]1[CH2:12][CH2:11][CH:10]([CH2:13][CH2:14][O:15][C:16]2[CH:17]=[C:18]([CH:24]=[CH:25][CH:26]=2)[C:19]([O:21]CC)=[O:20])[CH2:9][CH2:8]1)=[O:6])([CH3:3])[CH3:2].[OH-].[Na+]>C(O)C>[CH:1]([NH:4][C:5]([N:7]1[CH2:12][CH2:11][CH:10]([CH2:13][CH2:14][O:15][C:16]2[CH:17]=[C:18]([CH:24]=[CH:25][CH:26]=2)[C:19]([OH:21])=[O:20])[CH2:9][CH2:8]1)=[O:6])([CH3:3])[CH3:2]Ethyl 3-[2-(1-isopropylcarbamoyl-piperidin-4-yl)-ethoxy]-benzoate (0.67 g, 1.8 mmol) was dissolved in ethanol (25 ml), were upon NaOH (1 N, 10 ml) was added, and the solution was stirred overnight at 20° C. The reaction mixture was concentrated in vacuo, dissolved in HCl (1 N, 25 ml) and the resulting solution was extracted with EtOAc (3×25 ml). The combined organic extracts were dried (MgSO4) and evaporated to give 0.62 of the title compound. LC-MS (m/z): 336 (M+2).
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