5-[1,3-Dihydro-1-[cyano(carbamoyl)methylene]-2H-isoindole-3-ylidene]pyrimidine-2,4,6(1H,3H,5H)-trione

2-cyano-2-[2,3-dihydro-3-(tetrahydro-2,4,6-trioxo-5(2H)-pyrimidinylidene)-1H-isoindol-1-ylidene]acetamide

2-Cyano-2-[[2,3-dihydro-3-[2,4,6(1H,3H,5H)-trioxopyrimidin-5(2H)-ylidene]-1H-isoindol]-1-ylidene]acetamide