C([O:4][CH2:5][C@H:6]1[O:10][C@@H:9]([N:11]2[CH:19]=[C:17]([CH3:18])[C:15](=[S:16])[NH:14][C:12]2=[O:13])[CH:8]=[CH:7]1)(=O)C.N>CO>[C@@H:9]1([N:11]2[CH:19]=[C:17]([CH3:18])[C:15](=[S:16])[NH:14][C:12]2=[O:13])[O:10][C@H:6]([CH2:5][OH:4])[CH:7]=[CH:8]1To 100 mg of the compound synthesized in Example 9, 10 mL of methanol are added, which had been saturated at 0° C. with ammonia. The reaction mixture is kept for 12 hours at room temperature and then evaporated to dryness. Crystals, melting at 117° C.-118° C., are obtained from methanol/ether.
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