You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-2-[4-(2-fluorophenyl)piperazin-1-yl]-2-(furan-2-yl)ethyl]furan-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22FN3O3
assistant