[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[S:24][C:14]3=[N:15][C:16](Cl)=[C:17]([N+:20]([O-:22])=[O:21])[C:18](=[O:19])[N:13]3[N:12]=2)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].[NH3:25]>C(O)C.CN(C)C=O>[NH2:25][C:16]1[N:15]=[C:14]2[S:24][C:11]([C:8]3[CH:9]=[CH:10][C:5]([C:1]([CH3:4])([CH3:3])[CH3:2])=[CH:6][CH:7]=3)=[N:12][N:13]2[C:18](=[O:19])[C:17]=1[N+:20]([O-:22])=[O:21]1.9 g of 2-(4-tert-butylphenyl)-7-chloro-6-nitro-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one was suspended in a mixture of 20 ml of ethanol and 10 ml of dimethylformamide, and 5 ml of concentrated aqueous ammonia was added dropwise to the suspension while maintaining at a temperature of 60° C. to 70° C. After heating at that temperature for 2 hours, the mixture was cooled and the precipitate formed was separated by filtration to obtain 1.3 g of 7-amino-2-(4-tert-butylphenyl)-6-nitro-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one as pale yellow prisms having a melting point higher than 300° C.
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