You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(4-acetylpiperazin-1-yl)ethyl]-3-ethyl-1-hept-6-enyl-1-methylguanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C19H38IN5O
assistant