You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S)-1-[5-(4-methoxyphenyl)-1,3,4-oxadiazol-2-yl]ethyl] 1-benzothiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H16N2O4S
assistant