[CH3:1][O:2][C:3]1[C:4](=[O:23])[C:5]([CH3:22])=[C:6]([CH2:12][C:13]2[CH:21]=[CH:20][C:16]([C:17](O)=[O:18])=[CH:15][CH:14]=2)[C:7](=[O:11])[C:8]=1[O:9][CH3:10].[NH:24]1[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]1.Cl.C(N=C=NCCCN(C)C)C>C(Cl)Cl>[CH3:1][O:2][C:3]1[C:4](=[O:23])[C:5]([CH3:22])=[C:6]([CH2:12][C:13]2[CH:14]=[CH:15][C:16]([C:17]([N:24]3[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]3)=[O:18])=[CH:20][CH:21]=2)[C:7](=[O:11])[C:8]=1[O:9][CH3:10]To a solution of 4-(5,6-dimethoxy-3-methyl-1,4-benzoquinon-2-ylmethyl)benzoic acid (50 mg, 0.16 mmol) obtained in Example 21 and piperidine (0.021 ml, 0.21 mmol) in methylene chloride (2 ml) was added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (46 mg, 0.24 mmol), and then the mixture was stirred at room temperature for 1 hour. The reaction mixture was concentrated under reduced pressure and was purified by a silica gel column chromatography (hexane:ethyl acetate=1:2) to yield the title compound (30 mg, 0.08 mmol, yield 50%).
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