[CH2:1]([NH:8][CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH:16]([NH:18][NH:19][C:20]1[CH:25]=[CH:24][C:23]([N:26]=[C:27]=[S:28])=[CH:22][CH:21]=1)=[O:17]>C(O)C>[CH:16]([NH:18][NH:19][C:20]1[CH:25]=[CH:24][C:23]([NH:26][C:27]([N:8]([CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)=[S:28])=[CH:22][CH:21]=1)=[O:17]Dibenzylamine (0.20 g, 0.001 mole) and 4-(2-formylhydrazino)phenyl isothiocyanate (0.19 g, 0.001 mole) were mixed in ethanol (25 ml) and the resulting mixture was heated to reflux for 20 minutes. The reaction mixture was cooled to room temperature, then was chilled in ice. After scratching the flask walls, a white crystalline solid was separated out of solution. The solid was filtered off, washed thoroughly with ether, and allowed to dry. This gave 0.31 g (80 percent) of product as a white crystalline powder, m.p. 174°-176° C.
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