ethyl 6,7-epoxy-3α-ethenyl-1,2,3,6,7,11bα-hexahydro-10-methoxy-5H-3,5aα-methanonaphth<2,1-c>oxepin-12-endo-ylacetate

2-<2-(1,2-dihydro-5-methoxybenzocyclobutenyl)ethyl>-2-ethenyl-2,3,4,5-tetrahydro-4-phenylthiomethylenefuran-3-one

ethyl 3α-ethenyl-1,2,3,4,7,11bα-hexahydro-10-methoxy-6-oxo-5H-3,5aα-methanonaphth<2,1-c>oxepin-12-endo-ylacetate

4-acetoxymethylene-2-<2-(1,2-dihydro-5-methoxybenzocyclobutenyl)ethyl>-2-ethenyl-2,3,4,5-tetrahydrofuran-3-one