英文别名2-Ethyl-4-pyridinecarbonitrile; 2-Ethylpyridine-4-carbonitrile; 4-Cyano-2-ethylpyridine; 2-Ethylisonicotinonitril; 2-ethyl-4-cyanopyridine; 4-Pyridinecarbonitrile,2-ethyl; 2-Aethyl-isonicotinonitril; 2-ethyl-isonicotinonitrile; 2-Ethyl-4-cyan-pyridin; Ethionamide Impurity 4 
