You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[4-[[N-[2-(2,5-difluorophenyl)ethyl]-N'-methylcarbamimidoyl]amino]piperidin-1-yl]-N-propylacetamide .
user
C20H31F2N5O
assistant