You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[(2R)-4-[(2-methylpropan-2-yl)oxycarbonyl]-2-propylpiperazin-1-yl]methyl]benzoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H30N2O4
assistant