You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-tert-butyl-3-[1-(1,3-diethyl-2,4-dioxopyrimidin-5-yl)piperidin-3-yl]urea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H31N5O3
assistant