ethyl (E)-4-diazo-5-(naphthalen-2-yl)-5-oxo-3-(trifluoromethyl)pent-2-enoate

[4,6-Dimethoxy-5-methyl-pyran-(2E)-ylidene]-acetic acid ethyl ester

ethyl 5,5-dimethyl-3-oxo-2-triphenylphosphoranylidenehexanoate

ethyl 4-methylcyclohexylideneacetate

ethyl (4-methylcyclohexen-1-yl)acetate