[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([CH2:10][CH2:11][S:12][S:13][CH2:14][CH2:15][OH:16])=[CH:9][C:4]=2[O:3][CH2:2]1.Cl.[CH2:18](Cl)[C:19]1[CH:24]=[CH:23][CH:22]=[N:21][CH:20]=1.C(=O)([O-])[OH:27].[Na+].C(OCC)(=O)C>N1C=CC=CC=1.C1C=CC=CC=1>[C:18]([O:16][CH2:15][CH2:14][S:13][S:12][CH2:11][CH2:10][C:8]1[CH:7]=[CH:6][C:5]2[O:1][CH2:2][O:3][C:4]=2[CH:9]=1)(=[O:27])[C:19]1[CH:24]=[CH:23][CH:22]=[N:21][CH:20]=14 g of the 2-[{2-(1,3-benzodioxol-5-yl)ethyl}-dithio] ethanol prepared in Example 1 was dissolved in a mixture comprising 20 ml of pyridine and 50 ml of benzene to obtain a solution. 4 g of nicotinyl chloride hydrochloride was added to the solution. The obtained mixture was heated under reflux for 2 hours and poured into ice/water. The obtained mixture was weekly basified with sodium hydrogencarbonate. Ethyl acetate was added to the mixture to carry out the phase separation. The ethyl acetate layer was washed with water five times, dried over anhydrous sodium sulfate and distilled to remove the solvent. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=3:1) to obtain 5.4 g of the title compound as a colorless oil.
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