[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([C:15](=O)[CH2:16][CH2:17][C:18]([OH:20])=[O:19])=[CH:11][CH:10]=1.C1CCCCC1.C1(N)CCCCC1>C(OCC)(=O)C.CO>[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH2:16][CH2:17][C:18]([OH:20])=[O:19])=[CH:11][CH:10]=1Prepared analogous to Example 1 from 4-(2',4'-difluoro-4-biphenylyl)-4-oxo-butyric acid. Yield: 39% of theory; m.p. 76°-77° C. (from cyclohexane). Melting point of the cyclohexylamine salt: 127°-128° C. (from ethyl acetate/methanol 9:1).
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