英文别名2-Pyrazinecarboxamide, 6-chloro-3,4-dihydro-3-oxo-; 6-Chloro-3-oxo-3,4-dihydro-pyrazine-2-carboxamide; Favipiravir Impurity 4; 5-chloro-2-oxo-1H-pyrazine-3-carboxamide; Favipiravir Impurity 3; Favipiravir Impurity 8; 6-chloro-3-hydroxy-pyrazine-2-carboxylic acidamide; 6-Chloro-3-hydroxy-2-pyrazinecarboxamide 
