C([O:3][C:4]([C:6]1[NH:7][C:8]2[C:13]([CH:14]=1)=[C:12]([O:15][C:16]1[CH:17]=[C:18]([CH3:22])[CH:19]=[CH:20][CH:21]=1)[CH:11]=[CH:10][CH:9]=2)=[O:5])C.[Li+].[OH-]>CO.O>[C:18]1([CH3:22])[CH:19]=[CH:20][CH:21]=[C:16]([O:15][C:12]2[CH:11]=[CH:10][CH:9]=[C:8]3[C:13]=2[CH:14]=[C:6]([C:4]([OH:5])=[O:3])[NH:7]3)[CH:17]=1136 (520 mg, 1.761 mmol) is dissolved in 10 ml of methanol and treated with a solution of LiOH (84.3 mg, 3.52 mmol) in 5 ml of water. The mixture is stirred at room temperature for 18 hours. After evaporation, the crude product is acidified at 0° C. with 2M HCl and extracted with ethyl acetate. The organic layers are dried over sodium sulphate and evaporated.
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