英文别名5-fluoro-2-oxo-1H-pyrazine-3-carbonitrile; 2-Pyrazinecarbonitrile,6-fluoro-3,4-dihydro-3-oxo; 2-Pyrazinecarbonitrile, 6-fluoro-3,4-dihydro-3-oxo-; Favipiravir Impurity 13; 6-Fluoro-3-oxo-3,4-dihydro-2-pyrazinecarbonitrile; 6-fluoro-3-hydroxypyrazine-2-carbonitrile; FAVIPIRAVIR intermediate N-1; Pyrazinecarbonitrile, 6-fluoro-3,4-dihydro-3-oxo- 
