You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,3-dihydro-1,4-benzodioxin-3-yl)-5-[4-(4-fluorophenyl)oxan-4-yl]-1,3,4-oxadiazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19FN2O4
assistant