You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[1-[[N-ethyl-N'-[2-(3-fluorophenyl)ethyl]carbamimidoyl]amino]ethyl]-4-methyl-1,3-thiazole-5-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H27FN4O2S
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