You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-[N'-[[1-(4-fluorophenyl)cyclopropyl]methyl]carbamimidoyl]piperazine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H29FN4O2
assistant