You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-[[(1R,2S,3S)-2,3-dimethylcyclohexyl]amino]-1-oxopropan-2-yl] 4-ethoxybenzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H29NO4
assistant