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2-[N,N-Bis(Trifluoromethanesulfonyl)Amino]-5-Chloropyridine

2-Amino-5-chloropyrazine

2,5-Dichloropyrazine

2,5-Dibromopyrazine

2-Amino-3-methylpyrazine

5-Chloro-2-hydroxypyrazine

5-Bromopyrazin-2-ol

3,5-Bromopyrazin-2-ol

2,4-Dichloro-6-methyl-5-nitropyrimidine

5-Chloro-2-(methylthio)pyrimidine-4-carboxylic acid