You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(2-benzoylhydrazinyl)-1-oxopropan-2-yl] 4-ethyl-5-propylthiophene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24N2O4S
assistant