endo-二环[2.2.2]辛基-5-烯-2,3-二羧酸酸酐

马来酸酐

cyclohex-2-en-1-yl 2,2,2-trichloroacetate

cyclohexa-1,3-diene

(+/-)-exo,endo-5,6-dibromo-endo-bicyclo[2.2.2]octane-2,3-dicarboxylic anhydride