(2-Cyclopent-1-enyl-1-hydroxymethyl-2-oxo-ethyl)-phosphonic acid dimethyl ester

[1-(Cyclopent-1-enecarbonyl)-4-[1,3]dioxolan-2-yl-butyl]-phosphonic acid dimethyl ester

dimethyl (1-(cyclopent-1-en-1-yl)-1-oxo-2-(phenylselanyl)propan-2-yl)phosphonate

异丁醛

二乙基酮