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Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate 5-CHLORO-PYRAZINE-2-CARBOXYLIC ACID Methyl 5-chloropyrazine-2-carboxylate 6-Chloropyrazine-2-carboxylic acid 2-Chloropyrazine ETHYL 3-CHLOROQUINOXALINE-2-CARBOXYLATE METHYL 3-CHLORO-2-PYRAZINECARBOXYLATE METHYL 3,6-DICHLOROPYRAZINE-2-CARBOXYLATE 3-CHLOROQUINOXALINE-2-CARBOXYLIC ACID