1-甲基-5-氨基吡唑-4-羧酸乙酯

ethyl 5-amino-1,3-dimethylpyrazole-4-carboxylate

diethyl 3-amino-5-methylthiophene-2,4-dicarboxylate

ethyl 4-cyano-3-hydroxy-5-methylthiophene-2-carboxylate

5-氨基-3-甲基异恶唑-4-甲酸乙酯