You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1-butanoylpiperidin-4-yl)-3-[2-(3,5-difluorophenyl)-1,3-thiazol-5-yl]-1-methylurea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24F2N4O2S
assistant