You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[3-(4-hydroxypiperidin-1-yl)propyl]-2-[(2-prop-2-enoxyphenyl)methyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H34N4O2
assistant