[CH3:1][O:2][C:3]1[CH:4]=[C:5](/[C:11](=[CH:14]/[C:15]2[CH:20]=[CH:19][C:18]([OH:21])=[CH:17][CH:16]=2)/[C:12]#[N:13])[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].[C:22](OC(=O)C)(=[O:24])[CH3:23]>N1C=CC=CC=1>[C:22]([O:21][C:18]1[CH:17]=[CH:16][C:15](/[CH:14]=[C:11](\[C:12]#[N:13])/[C:5]2[CH:6]=[CH:7][C:8]([O:9][CH3:10])=[C:3]([O:2][CH3:1])[CH:4]=2)=[CH:20][CH:19]=1)(=[O:24])[CH3:23]Compound 1 (0.28 g) was acetylated with acetic anhydride and pyridine in accordance with a customary method, to thereby produce the target product (0.30 g, yield: 95%).
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