You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (3R)-1-[2-[(2R)-2-(4-ethoxyphenyl)pyrrolidin-1-yl]acetyl]piperidine-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H32N2O4
assistant