exo-cis-1,7-dimethyl-4,10-dioxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione

硫酸

1,4-dimethyl-7-oxabicyclo<2.2.1>hept-5-ene-2,3-dicarboxylic anhydride

2,5-二甲基呋喃

马来酸酐