3-乙酰基-2,5-二氢-4-羟基-5-氧代-2-(2-氧代丙基)-2-糠酸乙酯

1-(4-甲氧基苯基)-3-甲基-1H-吡唑-5-羧酸乙酯

1-(4-甲氧基-苯基)-5-甲基-1H-吡唑-3-羧酸乙酯

2,6-dimethyl-pyridine-3,4-dicarboxylic acid diethyl ester

乙酰乙酸乙酯