You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[[5-fluoro-2-(4,5,6,7-tetrahydrobenzimidazol-1-yl)pyridin-3-yl]methyl]propan-1-amine into its molecular formula.
user
C16H21FN4
assistant