1-茚酮

dimethyl (1S,4R,4aS,5S,9S,9aS)-6-oxo-4,4a,5,6,9,9a-hexahydro-1H-1,4-epoxy-5,9-ethenobenzo[7]annulene-2,3-dicarboxylate

4-methoxycarbonyl-2-oxatricyclo[6.2.2.01,5]dodeca-4,6,9,11-tetraen-3-one

(6S,6aR,7R,10S,10aS,10bS)-trimethyl 2-oxo-2,6,6a,7,10,10a-hexahydro-7,10-epoxy-6,10b-ethenobenzo[6,7]cyclohepta[1,2-b]furan-3,8,9-tricarboxylate

6,8a-ethenocyclohepta[b]furan-2(6H)-one