Pyrazinecarboxylicacid, 4,5-dihydro-5-oxo-, methyl ester (9CI);Pyrazinecarboxylic acid,5-hydroxy-, methyl ester (8CI);5-Hydroxypyrazine-2-carboxylic acid methylester;Methyl 5-hydroxy-2-pyrazinecarboxylate;Methyl5-oxo-4,5-dihydro-2-pyrazinecarboxylate;
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