Acetic acid (S)-3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-2-oxo-butyl ester

diethyl (S)-2-(phthalimido)propylphosphonate

[2-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-propionyl]-phosphonic acid diethyl ester

diisopropyl (2-(1,3-dioxoisoindolin-2-yl)allyl)phosphonate

diisopropyl (Z)-(2-(1,3-dioxoisoindolin-2-yl)prop-1-en-1-yl)phosphonate