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.[CH:16](=O)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>C(O)C>[CH2:16]([N:2]=[C: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:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=110 g of the compound of Example 2 are brought to reflux in 200 ml of ethanol in the presence of 2.8 g of benzaldehyde. A sample is removed, concentrated and recrystallized in ethanol.
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