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 1-[2-(2,6-dioxopiperidin-1-yl)ethyl]-3-[1-(3-fluorophenyl)piperidin-4-yl]-2-methylguanidine .
user
C20H28FN5O2
assistant