You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[(3R)-3-(3-methylbutoxy)pyrrolidin-1-yl]-4-oxobutyl]-6-nitro-1,3-benzoxazol-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N3O6
assistant