You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[1-(pyridin-2-ylmethyl)piperidin-4-yl]-2-[(3-pyridin-2-ylphenyl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33IN6
assistant