3-[2,2-Bis(ethoxycarbonyl)]ethyl-4-methyl-2,5-furandione

1-O-ethyl 2-O,4-O-dimethyl 1-methylbut-1-ene-1,2,4-tricarboxylate

1-methylbut-1-ene-1,2,4-tricarboxylic acid

2-氧代戊烷-1,5-二甲酸二乙酯

3-(bromomethyl)-4-methylfuran-2,5-dione