英文别名Favipiravir Impurity 4; Favipiravir Impurity 9; Favipiravir Impurity 23; Favipiravir Impurity19; 2-Pyrazinecarbonitrile, 3-bromo-5-chloro-; 3-bromo-5-chloro-2-cyano-pyrazine; Pyrazinecarbonitrile,3-bromo-5-chloro-(9CI); 3-bromo-5-chloro-pyrazine-2-carbonitrile 
