[C:1]12([NH:11][C:12](=[O:31])[CH2:13][CH2:14][C:15]3[CH:20]=[CH:19][C:18]([NH:21]C(=O)C(F)(F)F)=[C:17]([N+:28]([O-:30])=[O:29])[CH:16]=3)[CH2:10][CH:5]3[CH2:6][CH:7]([CH2:9][CH:3]([CH2:4]3)[CH2:2]1)[CH2:8]2.[OH-].[Na+]>CO>[C:1]12([NH:11][C:12](=[O:31])[CH2:13][CH2:14][C:15]3[CH:20]=[CH:19][C:18]([NH2:21])=[C:17]([N+:28]([O-:30])=[O:29])[CH:16]=3)[CH2:10][CH:5]3[CH2:4][CH:3]([CH2:9][CH:7]([CH2:6]3)[CH2:8]1)[CH2:2]20.5 g of N-(1-Adamantyl)-3-(3-nitro-4-trifluoroacetamidophenyl)propionamide (prepared as described in Example 20) was dissolved in 10 ml of methanol. 10 ml of a 2N aqueous solution of sodium hydroxide were then added to the solution, which was then stirred for 3 hours at room temperature. At the end of this time, the methanol was removed by distillation under reduced pressure. Extraction of the residue with ethyl acetate afforded the title compound as an oily substance.
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