Acetamide,2-cyano-2-[3-[1-cyano-2-[(2,3-dihydro-1,3-dioxo-1H-isoindol-4-yl)amino]-2-oxoethylidene]-2,3-dihydro-1H-isoindol-1-ylidene]-N-[4-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)methyl]phenyl]-