1-((1S,3R,7R)-4,4-Dioxo-4λ6-thia-tricyclo[5.2.1.02,6]dec-8-en-3-yl)-ethanone

1-((1R,4R,7S)-2,2-dioxido-1,3,3a,4,7,7a-hexahydro-4,7-methanobenzo[c]thiophen-1-yl)pentan-1-one

2-methyl-5-norbornen-2-yl exo-acetoacetate

2-methyl-5-norbornen-2-yl endo-acetoacetate

(1S,3S,7R)-3-Isopropyl-4-thia-tricyclo[5.2.1.02,6]dec-8-ene 4,4-dioxide