3-甲基吡唑-4-羧酸

allophanoyl-4 methyl-3 pyrazole

1,3-二甲基-1H-吡唑-4-羧酸

ethyl 3-methyl-1-phenylpyrazole-4-carboxylate

5-乙酰基-1,3-二甲基-2,4(1H,3H)-嘧啶二酮