![3-[(4-Nitrobenzoyl)amino]pyrazine-2-carboxylic acid methyl ester](https://www.synchem.de/wp-content/uploads/2017/05/wh127-247x124.png)
![3-[(4-Methoxybenzoyl)amino]pyrazine-2-carboxylic acid methyl ester](https://www.synchem.de/wp-content/uploads/2017/05/wh128-247x124.png)
3-[(4-Methoxybenzoyl)amino]pyrazine-2-carboxylic acid methyl ester
![3-[(4-Methylbenzoyl)amino]pyrazine-2-carboxylic acid methyl ester](https://www.synchem.de/wp-content/uploads/2017/05/wh129-247x124.png)
3-[(4-Methylbenzoyl)amino]pyrazine-2-carboxylic acid methyl ester
3-(Benzoyl)aminopyrazine-2-carboxylic acid methyl ester
3-(Dibenzoylamino)-2-pyrazinecarboxylic acid methyl ester
![3-[Bis(4-methylbenzoyl)amino]-2-pyrazinecarboxylic acid methyl ester](https://www.synchem.de/wp-content/uploads/2017/05/wh132-247x124.png)
3-[Bis(4-methylbenzoyl)amino]-2-pyrazinecarboxylic acid methyl ester
![3-[(4-Chlorobenzoyl)amino]-2-pyrazinecarboxylic acid hydrazide](https://www.synchem.de/wp-content/uploads/2017/05/wh133-247x124.png)
3-[(4-Chlorobenzoyl)amino]-2-pyrazinecarboxylic acid hydrazide
3-Acetamidopyrazinecarboxylic acid methyl ester
![2-Phenyl-4H-pyrazino[2,3-d][1,3]oxazin-4-one](https://www.synchem.de/wp-content/uploads/2017/05/wh135-247x124.png)