You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-fluoro-N-[1-[2-[(5-methyl-1,3,4-thiadiazol-2-yl)amino]-2-oxoethyl]-3,4-dihydro-2H-quinolin-5-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20FN5O2S
assistant