p. 2541 - 2548
(2018/04/12)(+/-)-bicyclo[2.2.2]octane-1,2r,3c-tricarboxylic acid-1-ethyl ester-2,3-anhydride
ethyl 1,3-cyclohexadiene-1-carboxylate
ethyl 2-(diethylamino)cyclohex-3-ene-1-carboxylate
ethyl 3,5-dioxo-4-oxatricyclo[5.2.2.02,6]undec-8-ene-1-carboxylate