You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[[[(1R,2S)-2-aminocyclohexyl]-methylamino]methyl]-2-(2,6-dioxopiperidin-3-yl)isoindole-1,3-dione .
user
C21H26N4O4
assistant