1 4DP 3-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2h-isoindol-2-yl]-L-alanine 1.000 2 4DB (2s)-2-amino-4-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2h-isoindol-2-yl]butanoic acid 0.708