You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name tert-butyl 4-[N'-[[4-(difluoromethoxy)-3-ethoxyphenyl]methyl]carbamimidoyl]piperazine-1-carboxylate;hydroiodide into its molecular formula.
user
C20H31F2IN4O4
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