You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 1-[2-(3,4-dihydro-2H-quinolin-1-yl)-2-oxoethyl]-3-ethyl-2-[(4-fluorophenyl)methyl]guanidine;hydroiodide ?
user
C21H26FIN4O
assistant