You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 1-[1-(cyclopentanecarbonyl)pyrrolidin-3-yl]-2-(2,2-diethyl-4-hydroxybutyl)-3-ethylguanidine;hydroiodide ?
user
C21H41IN4O2
assistant