2-ethyl-5-methyl-4H-pyrazol-3-one

4-methyl-7-hydroxy-8-nitro coumarin

methyl 7-chloro-3-oxoheptanoate

1,4-二氢-2,6-二甲基-4-氧代吡啶-3-羧酸乙酯

十八烷基乙酰乙酸酯