[OH:1][C@H:2]1[CH2:16][CH:15]=[C:14]2[C@:4]([CH3:17])([CH2:5][C:6]3[C:7](=[CH:13]2)[O:8][C:9](=[O:12])[C:10]=3[CH3:11])[C@H:3]1[CH3:18].[C:19](Cl)(=[O:23])[CH:20]([CH3:22])[CH3:21]>>[CH3:21][CH:20]([CH3:22])[C:19]([O:1][C@H:2]1[CH2:16][CH:15]=[C:14]2[C@:4]([CH3:17])([CH2:5][C:6]3[C:7](=[CH:13]2)[O:8][C:9](=[O:12])[C:10]=3[CH3:11])[C@H:3]1[CH3:18])=[O:23]The title compound was prepared in the same manner as in Example B2, except that the compound prepared in Example B1 was reacted with isobutyryl chloride.
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