You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(7,7-dimethyl-2-oxabicyclo[3.2.0]heptan-6-yl)-3-ethyl-2-[[4-fluoro-3-(methoxymethyl)phenyl]methyl]guanidine into its molecular formula.
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C20H30FN3O2
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