N-(Phthalimidylacetyl)-Gly-Gly-OH

N-(2-Phthalimidylacetyl)-Gly-Gly-OH

N-[[(1,3-Dihydro-1,3-dioxo-2H-isoindol)-2-yl]acetyl]Gly-Gly-OH

N-[N-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)acetyl]glycyl]glycine