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4,6-Dimethyl-2,3-pyridinediamine

5,6-Diaminonicotinic acid

4,6-Dimethoxy-5-pyrimidinecarbaldehyde

2,6-Dichloro-1H-pyrimidin-4-one

5,6-Dichloro-2,3-pyrazinedicarboxylic acid

6-Chloro-5-nitro-2,4-pyrimidinediol

6-Chloro-2,3-pyridinedicarboxylic acid

6-Chloro-8-quinolinecarboxylic acid

5-Chloro-4-methoxypyridin-2-ylamine

4-Chloro-5-hydroxy-2H-pyridazin-3-one