You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-ethyl-3-[3-[4-(2-fluorophenyl)piperazin-1-yl]propyl]-2-[(1-methylpyrrol-3-yl)methyl]guanidine into its molecular formula.
user
C22H33FN6
assistant