You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(2-chloro-6-fluorophenyl)cyclopropyl]-2-methyl-3-[3-(oxan-4-ylmethoxy)propyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H29ClFN3O2
assistant