You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-(4-fluorophenyl)-N'-[2-(2-oxo-1,3-dihydroindol-3-yl)ethyl]piperazine-1-carboximidamide;hydroiodide .
user
C21H25FIN5O
assistant