3,6-dioxo-2,3,4,6-tetrahydropyrazino[2,1-a]isoindole-1-carbonitrile InChI=1/C12H7N3O2/c13-5-9-11-7-3-1-2-4-8(7)12(17)15(11)6-10(16)14-9/h1-4H,6H2,(H,14,16 pyrazino[2,1-a]isoindole-1-carbonitrile, 2,3,4,6-tetrahydro-3,6-dioxo-