2-Pyrazinecarboxylic acid, 4,5-dihydro-5-oxo-, methyl ester
Pyrazinecarboxylic acid, 5-hydroxy-, methyl ester
Pyrazinecarboxylic acid, 4,5-dihydro-5-oxo-, methyl ester
Methyl 4,5-dihydro-5-oxo-2-pyrazinecarboxylate
Methyl 5-hydroxy-2-pyrazinecarboxylate
Methyl 5-oxo-4,5-dihydro-2-pyrazinecarboxylate
5-Hydroxypyrazine-2-carboxylic acid methyl ester