ethyl 3-(diethylamino)-3-oxopropanoate

6-oxoundecanedioic acid

2,6-二疏基-4-氧代-4H-硫代吡喃-3,5-二羧酸二乙酯

ethyl 3-(tert-butylamino)-3-oxopropanoate

2,4-二甲基吡咯-3,5-二羧酸二乙酯