You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-[7-[(3-amino-4,4-dimethylpiperidin-1-yl)methyl]-3-oxo-1H-isoindol-2-yl]piperidine-2,6-dione .
user
C21H28N4O3
assistant