You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[5-[2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-2-oxoethyl]sulfanyl-1,3,4-thiadiazol-2-yl]-4-fluorobenzamide .
user
C18H21FN4O2S2
assistant