[NH2:1][C:2]1[CH:6]=[N:5][N:4]([CH2:7][CH2:8][CH2:9][CH2:10][C:11]#[N:12])[N:3]=1.[CH2:13]([N:15]=[C:16]=[S:17])[CH3:14]>C(#N)C>[CH2:13]([NH:15][C:16](=[S:17])[NH:1][C:2]1[CH:6]=[N:5][N:4]([CH2:7][CH2:8][CH2:9][CH2:10][C:11]#[N:12])[N:3]=1)[CH3:14]A solution of 5-(4-amino-1,2,3-triazol-2-yl)valeronitrile (1.65 g.) in acetonitrile (6 ml.) was treated with ethylisothiocyanate (0.87 g.) and the solution stirred for 2.5 days then heated under reflux for 4.5 hours. Evaporation of the solvent gave 5-[4-(3-ethylthioureido)-1,2,3-triazol-2-yl]valeronitrile.
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