[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][C@H:16]([O:29][CH2:30][CH3:31])[C:17](N[C@H](C2C=CC=CC=2)CO)=[O:18])=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.S(=O)(=O)(O)[OH:33]>O.O1CCOCC1>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([CH2:15][C@H:16]([O:29][CH2:30][CH3:31])[C:17]([OH:18])=[O:33])=[CH:13][CH:14]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=13-(4-Benzyloxyphenyl)-(S)-2-ethoxy-N-(2-hydroxy-(R)-1-phenylethyl)propanoic amide (8.9 g; 21.22 in mole) was hydrolyzed with concentrated sulfuric acid (27 ml) in water (104 ml) and dioxane (104 ml) at 90° C. for 5 hours. The reaction mixture was poured onto water (220 ml) and extracted with ethyl acetate. The organic phase was washed with brine, dried (sodium sulfate) and the solvent was evaporated in vacuo to give 6.85 g of a mixture of 3-(4-benzyloxyphenyl)-2-(S)-ethoxypropanoic acid and (S)-2-ethoxy-3-(4-hydroxyphenyl)-propanoic acid, which was used without further purification.
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