You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[methyl-[4-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)butylcarbamoyl]amino]-2-oxopyrrolidin-1-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H29N5O4
assistant