You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-ethyl-3-[2-(3-hydroxyphenyl)ethyl]-2-[2-[1-(2,2,2-trifluoroethyl)piperidin-4-yl]ethyl]guanidine into its molecular formula.
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C20H31F3N4O
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