2-Pyrazinecarboxylic acid, 3,4-dihydro-3-oxo-5-phenyl-
Pyrazinecarboxylic acid, 3,4-dihydro-3-oxo-5-phenyl-
Pyrazinoic acid, 3-hydroxy-5-phenyl-
3,4-Dihydro-3-oxo-5-phenyl-2-pyrazinecarboxylic acid
3-Hydroxy-5-phenyl-2-pyrazinecarboxylic acid
3-Oxo-5-phenyl-3,4-dihydropyrazine-2-carboxylic acid
3-Oxo-5-phenyl-3,4-dihydro-pyrazine-2-carboxylic acid