You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(4-benzylpiperidin-1-yl)butyl]-3-[1-(2-methoxyethyl)piperidin-4-yl]-2-methylguanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H45N5O
assistant