[OH:1][CH:2]1[C:19](=[O:20])[C:18]2[C:17]3[N:16]([CH3:21])[C:15]4[N:14]=[C:13]5[CH:22]=[CH:23][CH:24]=[CH:25][C:12]5=[CH:11][C:10]=4[C:9](=[O:26])[C:8]=3[C:7]([O:27][CH3:28])=[CH:6][C:5]=2[O:4][C:3]1([CH3:30])[CH3:29].[C:31](OC(=O)C)(=[O:33])[CH3:32]>>[C:31]([O:1][CH:2]1[C:19](=[O:20])[C:18]2[C:17]3[N:16]([CH3:21])[C:15]4[N:14]=[C:13]5[CH:22]=[CH:23][CH:24]=[CH:25][C:12]5=[CH:11][C:10]=4[C:9](=[O:26])[C:8]=3[C:7]([O:27][CH3:28])=[CH:6][C:5]=2[O:4][C:3]1([CH3:30])[CH3:29])(=[O:33])[CH3:32]The product is obtained according to the procedure of Example 13 starting from the compound of Example 15 and using acetic anhydride instead of butyryl chloride.
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