You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-(1,3-benzodioxol-5-yl)-5-propyl-1H-pyrazol-4-yl]-2-(4-fluorophenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20FN3O3
assistant