You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[[2-oxo-2-[(2S)-2-(pyrrolidin-1-ylmethyl)piperidin-1-yl]ethyl]amino]phenyl]propane-1-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H34N4O3S
assistant