This compound can be obtained by two different ways: 1) By cyclization of 2,5-dichlorobenzonitrile (I) with dicyandiamide (II) with KOH in refluxing methyl cellosolve, followed by treatment with maleic acid in dioxane. 2) By treatment of 2,4-dichloro-6-(2,5-dichlorophenyl)-s-triazine (III) with 28% aqueous ammonia at 100 C.

This compound can be obtained by two different ways: 1) By cyclization of 2,5-dichlorobenzonitrile (I) with dicyandiamide (II) with KOH in refluxing methyl cellosolve, followed by treatment with maleic acid in dioxane. 2) By treatment of 2,4-dichloro-6-(2,5-dichlorophenyl)-s-triazine (III) with 28% aqueous ammonia at 100 C.

This compound can be obtained by two different ways: 1) By cyclization of 2,5-dichlorobenzonitrile (I) with dicyandiamide (II) with KOH in refluxing methyl cellosolve, followed by treatment with maleic acid in dioxane. 2) By treatment of 2,4-dichloro-6-(2,5-dichlorophenyl)-s-triazine (III) with 28% aqueous ammonia at 100 C.