1,14-dimethyl-4,10-dioxatetracyclo[5.5.2.0,.0,]tetradec-13-ene-3,5,9,11-tetrone;
(+-)-1,8-Dimethyl-bicyclo[2.2.2]oct-7-en-2exo,3exo,5exo,6exo-tetracarbonsaeure-2,3,5,6-dianhydrid;
1,14-dimethyl-4,10-dioxatetracyclo[5.5.2.0^{2,6}.0^{8,12}]tetradec-13-ene-3,5,9,11-tetrone;
1,8-Dimethylbicyclo[2.2.2]oct-7-ene-exo-2,3,5,6-tetracarboxylic acid dianhydride;
1,14-Dimethyl-4,10-dioxatetracyclo[5.5.2.0.0]tetradec-13-ene-3,5,9,11-tetrone;
4,8-Etheno-1H,3H-benzo[1,2-c:4,5-c']difuran-1,3,5,7-tetrone, 3a,4,4a,7a,8,8a-hexahydro-4,9-dimethyl-;
1,14-dimethyl-4,10-dioxatetracyclo[5.5.2.02,608,12]tetradec-13-ene-3,5,9,11-tetraone;
(+-)-1,8-dimethyl-bicyclo[2.2.2]oct-7-ene-2exo,3exo,5exo,6exo-tetracarboxylic acid-2,3,5,6-dianhydride;