Cl.[NH2:2][CH:3]1[CH2:15][C:14]2[C:6](=[CH:7][C:8]3[CH2:12][CH2:11][O:10][C:9]=3[CH:13]=2)[CH2:5][CH2:4]1.C(N(CC)CC)C.[F:23][C:24]([F:31])([F:30])[C:25](OCC)=[O:26]>CO>[F:23][C:24]([F:31])([F:30])[C:25]([NH:2][CH:3]1[CH2:15][C:14]2[C:6](=[CH:7][C:8]3[CH2:12][CH2:11][O:10][C:9]=3[CH:13]=2)[CH2:5][CH2:4]1)=[O:26]A mixture containing 5 g of the compound of Example 2, 3.35 ml of triethylamine and 4 ml of ethyl trifluoroacetate in 7 ml of methanol is stirred for 4 hours at room temperature. The mixture is then evaporated to dryness and the dry residue obtained is recrystallized in isopropyl ether.
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