(6E,13E)-1,4-dioxaspiro[4.9]tetradeca-6,13-diene

1-(cyclohept-1-en-1-yl)-3-diazopropan-2-one

2-(2-oxopropyl)cycloheptan-1-one

7-(2-ethoxyallylidene)bicyclo[4.1.0]heptane

7-(1-hydroxy-2-ethoxyprop-2-en-1-yl)-7-(trimethylsilyl)bicyclo<4.1.0>heptane