C(O[C:6]([N:8]([C@H:10]1[CH2:14][CH2:13][N:12]([S:15]([C:18]2[C:19]3[C:20]([Cl:31])=[CH:21][N:22]=[C:23]([O:28][CH2:29][CH3:30])[C:24]=3[CH:25]=[CH:26][CH:27]=2)(=[O:17])=[O:16])[CH2:11]1)C)=O)(C)(C)C.[F:32][C:33]([F:38])([F:37])[C:34]([OH:36])=[O:35]>ClCCl>[CH3:6][NH:8][C@H:10]1[CH2:14][CH2:13][N:12]([S:15]([C:18]2[C:19]3[C:20]([Cl:31])=[CH:21][N:22]=[C:23]([O:28][CH2:29][CH3:30])[C:24]=3[CH:25]=[CH:26][CH:27]=2)(=[O:16])=[O:17])[CH2:11]1.[F:32][C:33]([F:38])([F:37])[C:34]([O-:36])=[O:35]Intermediate 38a (141 mg) obtained in Step A was dissolved in a solution of trifluoroacetic acid (0.9 ml, Aldrich) in dichloromethane (2.1 ml), and the solution was stirred at room temperature 5 hours. The solvent was evaporated under reduced pressure to obtain the title compound as trifluoroacetate (145 mg).
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