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

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