[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].[Cl-].[CH3:23][O:24][C:25](=[O:31])[CH2:26][CH2:27][C:28](O)=[O:29]>N1C=CC=CC=1>[C:28]([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:29])[CH2:27][CH2:26][C:25]([O:24][CH3:23])=[O:31]Compound 1 (50 mg) and succinic acid monomethyl ester chloride (44 μL) were dissolved in pyridine (1 mL), followed by stirring for a whole day and night. After completion of reaction, the resultant reaction mixture was concentrated to dryness under reduced pressure, followed by purification by means of silica gel chromatography employing a chloroform/methanol system, to thereby produce the target product (63 mg, yield: 90%).
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