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 3-[4-[[3-(1-aminoethyl)piperidin-1-yl]methyl]-3-oxo-1H-isoindol-2-yl]piperidine-2,6-dione .
user
C21H28N4O3
assistant