Ethyl 5-methyl-2-oxo-1,2-dihydro-3-pyridinecarboxylate

2-氰基-3-(吡啶-2-氨基)-丙烯酸乙酯

7-氨基-2-甲基硫代噻唑嘧啶-6-羧酸乙酯

5-氨基-1-乙基吡唑-4-羧酸乙酯

N1-ethyl-3-amino-4-carboethoxypyrazole