You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[(3R)-1-[[2-(2,6-dioxopiperidin-3-yl)-1-oxo-3H-isoindol-4-yl]sulfonyl]pyrrolidin-3-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N4O7S
assistant