C(OC([NH:8][C@H:9]([C:17]([N:19]([CH3:25])[CH2:20][C:21](OC)=[O:22])=[O:18])[CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=O)(C)(C)C.FC(F)(F)C(O)=O.C(N(CC)CC)C>CO>[CH2:10]([CH:9]1[C:17](=[O:18])[N:19]([CH3:25])[CH2:20][C:21](=[O:22])[NH:8]1)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1The compound obtained in Step (i) was treated with trifluoroacetic acid (30 ml), and then the resultant was heated under reflux in methanol in the presence of triethylamine to give the subtitle compound.
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