Cl.[C:2]([NH2:10])(=[NH:9])[C:3]1[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=1.C(O)C.C[O-].[Na+].[C:17]1([N:23]=[N:24][CH:25]([C:28]#[N:29])[C:26]#[N:27])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>O>[C:17]1([N:23]=[N:24][C:25]2[C:26]([NH2:27])=[N:9][C:2]([C:3]3[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=3)=[N:10][C:28]=2[NH2:29])[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=1The intermediate 5-(phenylazo)-2-(4-pyridinyl)-4,6-pyrimidinediamine was prepared as follows: a mixture containing 477 g of isonicotinamidine hydrochloride, 3 liters of ethanol and 170 g of sodium methoxide was stirred for 30 minutes and to the mixture was added 340 g of α-(phenylazo)malononitrile and the reaction mixture was stirred under reflux for 5 hours and then poured into 3 liters of water. The solid that separated was collected, washed with water and dried in a vacuum oven at 90°-95° C. to yield 356 g of 5-(phenylazo)-2-(4-pyridinyl)-4,6-pyrimidinediamine, m.p. 302°-305° C.
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