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 ethyl 3-[3-[5-[4-(2-bromo-5-fluorophenoxy)piperidin-1-yl]-1,3,4-thiadiazol-2-yl]-1,2,4-oxadiazol-5-yl]propanoate .
user
C20H21BrFN5O4S
assistant