You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(2-ethylsulfanyl-3-methyl-6,7-dihydro-4H-imidazo[4,5-c]pyridin-5-yl)-1-(4-methoxyphenyl)ethanol into its molecular formula.
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C18H25N3O2S
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