You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[2-(4-fluorophenyl)-4-methyl-1,3-thiazol-5-yl]ethyl]-2-methyl-3-nitrobenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18FN3O3S
assistant