英文别名Zopiclone Impurity 6; 3-(5-chloro-pyridin-2-ylcarbamoyl)-pyrazine-2-carboxylic acid; 3-(5-chloropyridin-2-yl)-carbamoylpyrazine-2-carboxylic acid; 3-{[(5-chloropyridin-2-yl)amino]carbonyl}pyrazine-2-carboxylic acid; 3-(5-chloropyrid-2-yl)carbamoyl-pyrazine-2-carboxylic acid; 3-{[(5-chloropyridin-2-yl)amino]carbonyl}pyrazin-2-carboxylic acid; Eszopiclone Impurity 7; 2-Pyrazinecarboxylic acid, 3-[[(5-chloro-2-pyridinyl)amino]carbonyl]- 
