5-氰基-1-叔丁基-1H-吡唑-4-羧酸乙酯

3,4-吡咯二羧酸二乙酯

methyl 2-(3-oxo-2,4-dihydro-1H-quinoxalin-2-yl)acetate

ethyl 2-(3-butyl-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-yl)acetate

甲酸基丁二酸二乙酯