草单鸟苷酰肼

4-hydroxy-1,4-benzoxazine-2,3-dione

ethyl 2-oxo-2-(2-oxoheptylamino)acetate

3-(4-甲基苯基)-1,2,4-噁二唑-5-羧酸乙酯

Ethyl 4,4-dimethyl-2-oxopentanoate