You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-ethyl-2-[2-(2-ethyl-1,3-thiazol-4-yl)ethyl]-3-[1-(3-fluoropyridin-2-yl)pyrrolidin-3-yl]guanidine into its molecular formula.
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C19H27FN6S
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