You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,3-difluorophenyl)ethyl]-N'-methyl-4-(oxolane-2-carbonyl)piperazine-1-carboximidamide;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27F2IN4O2
assistant