Lenalidomide Impurity 1

3-amino-N-[2-(2,6-dioxo-3-piperidinyl)-2,3-dihydro-1-oxo-1H-isoindol-4-yl]-Propanamide, hydrochloride 2,6-Piperidinedione, 3-(1,3-dihydro-5-nitro-1-oxo-2H-isoindol-2-yl)- Lenalidomide Impurity 4 Lenalidomide Impurity 11 2H-Isoindole-2-butanoic acid, 4-amino-γ-(aminocarbonyl)-1,3-dihydro-1-oxo- Lenalidomide Impurity 3 Lenalidomide Impurity 13 Lenalidomide Impurity 1 Lenalidomide Impurity 14 Benzoic acid, 2-(dibromomethyl)-3-nitro-, methyl ester Lenalidomide Impurity 15 Lenalidomide Impurity 12 Methyl 2-(chloromethyl)-3-nitrobenzoate 2(1H)-Pyrazinone, 4-(cyclohexylcarbonyl)-3,4-dihydro-1-(2-phenylethyl)- 3-(5-Amino-1-oxo-isoindolin-2-yl)piperidine-2,6-dione Lenalidomide Impurity 16