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ETHYL 2-QUINOXALINECARBOXYLATE 2,3-Pyrazinecarboxylic anhydride Methyl 5-chloropyrazine-2-carboxylate METHYL 5-METHYLPYRAZINE-2-CARBOXYLATE Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate 2-Pyrazinecarboxylic acid 2-(ETHOXYCARBONYL)-3-METHYLQUINOXALINEDIIUM-1,4-DIOLATE 2-(METHOXYCARBONYL)-3-METHYLQUINOXALINEDIIUM-1,4-DIOLATE