II.[I-].[K+].[SH:5][C:6](=[CH:10][C:11]1[O:12][CH:13]=[CH:14][CH:15]=1)[C:7]([OH:9])=[O:8]>O.C(#N)C>[O:12]1[CH:13]=[CH:14][CH:15]=[C:11]1[CH:10]=[C:6]([S:5][S:5][C:6](=[CH:10][C:11]1[O:12][CH:13]=[CH:14][CH:15]=1)[C:7]([OH:9])=[O:8])[C:7]([OH:9])=[O:8]Iodine is added to a solution of 100 g of potassium iodide in 500 ml of water to saturation. This saturated solution is added dropwise to a solution of α-mercapto-β-(2-furyl)acrylic acid in 500 ml of acetonitrile and 30 ml of water until the color of iodine persists. The crude product which precipitates is recrystallized from methanol. M.P. 215° C.
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