You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[2-(3-ethyl-1,2,4-triazol-4-yl)ethyl]-2-[4-(2-methyl-6-oxopyridin-1-yl)butyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H32IN7O
assistant