[CH3:1][C:2]1[CH:22]=[CH:21][CH:20]=[C:19]([CH3:23])[C:3]=1[CH2:4][O:5][C:6]1[CH:7]=[C:8]([C:12](=[O:18])[CH2:13][CH2:14][C:15]([OH:17])=[O:16])[CH:9]=[CH:10][CH:11]=1.[OH-].[K+:25]>C(O)C>[K+:25].[CH3:23][C:19]1[CH:20]=[CH:21][CH:22]=[C:2]([CH3:1])[C:3]=1[CH2:4][O:5][C:6]1[CH:7]=[C:8]([C:12](=[O:18])[CH2:13][CH2:14][C:15]([O-:17])=[O:16])[CH:9]=[CH:10][CH:11]=1The 4-(3-(2,6-Dimethylbenzyloxy)phenyl)-4-oxobutyric acid (Step D, 6.0 g, 19.4 mmol) was dissolved in abs ethanol (20 ml) by warming gently followed by addition of KOH (1.21 g) at 0° C. temperature. The reaction mixture was stirred for one hour, concentrated in vaccuo and lyophilized to give the title compound as white solid.
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