You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[1-(2-ethoxyethyl)cyclopropyl]methyl]-3-ethyl-1-[2-(2-fluorophenoxy)ethyl]-1-methylguanidine by IUPAC nomenclature, provide its molecular formula.
user
C20H32FN3O2
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