3-amino-6-(4-methylsulfonylphenyl)pyrazine-2-carboxylic acid

3-amino-6-bromo-N-phenyl-pyrazine-2-carboxamide

3-氨基吡嗪-2-羧酸甲酯

3-氨基-6-溴吡嗪-2-甲酸甲酯