The molecule is a dicarboximide that is isoindole-1,3(2H)-dione in which the hydrogen attached to the nitrogen is substituted by a 2,6-dioxopiperidin-3-yl group. It is a member of piperidones and a member of phthalimides.
2-(2,6-dioxopiperidin-3-yl)isoindole-1,3-dione