You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-methyl-N'-[4-[2-[3-(2-oxo-2-pyrrolidin-1-ylethoxy)propyl]phenyl]butyl]oxamide is given. What is its corresponding molecular formula?
user
C22H33N3O4
assistant