[C:1]1([C:7]([NH:9][C:10]2[NH:11][CH:12]=[CH:13][N:14]=2)=[S:8])C=C[CH:4]=[CH:3][CH:2]=1.S(Cl)([Cl:18])(=O)=[O:16]>C(Cl)(Cl)Cl>[ClH:18].[O:16]1[CH:4]=[CH:3][CH:2]=[C:1]1[C:7]1[S:8][N:11]2[CH:12]=[CH:13][N:14]=[C:10]2[N:9]=1To a solution of 0.19 g. of 2-(2-furylthiocarbonylamino)-imidazole [(IV), R = 2-furyl] in 25 ml. of chloroform, at 20°-25°C, there is added dropwise 0.09 ml. of sulfuryl chloride in 5 ml. of chloroform. After four hours, the reaction mixture is chilled in ice, followed by filtration to yield 2-(2-furyl)-1,2,4-thiadiazolo-[2,3-a]-imidazole hydrochloride.
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