[CH2:1]1[O:9][C:8]2[CH:7]=[CH:6][C:5]([CH:10]=[CH:11][C:12](=[O:20])[CH2:13][N:14]3[CH2:19][CH2:18][O:17][CH2:16][CH2:15]3)=[CH:4][C:3]=2[O:2]1.O>CO>[CH2:1]1[O:9][C:8]2[CH:7]=[CH:6][C:5]([CH:10]=[CH:11][CH:12]([OH:20])[CH2:13][N:14]3[CH2:15][CH2:16][O:17][CH2:18][CH2:19]3)=[CH:4][C:3]=2[O:2]127.5 g of the ketone (0.1 M) obtained in Example 1 is dissolved in 300 cm3 of methanol and an aqueous solution of KBH4 is added dropwise. The reaction mixture is left overnight and decomposed with water. The product obtained is filtered and recrystallised in ethanol.
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