You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-oxo-1-(propylamino)propan-2-yl] 3-[(2-methylpropan-2-yl)oxycarbonylamino]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26N2O5
assistant