methyl 3-[(4-chlorobenzoyl)amino]pyrazine-2-carboxylate

methyl 3-[(4-nitrobenzoyl)amino]pyrazine-2-carboxylate

吡嗪-2,3-二羧酸 二甲酯

7,8-dihydro-[1,3]thiazolo[2,3-b]pteridin-10-one

3-[(4-acetamidophenyl)sulfonylamino]pyrazine-2-carboxamide