You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[1-(2-cyanophenyl)piperidin-3-yl]-3-ethyl-2-[2-(furan-2-yl)-2-hydroxyethyl]guanidine;hydroiodide .
user
C21H28IN5O2
assistant