You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-ethyl-N'-[2-(3-fluorophenoxy)ethyl]-4-pyridin-2-ylpiperazine-1-carboximidamide;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C20H27FIN5O
assistant