You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-(1-benzothiophen-3-yl)ethyl]-3-[(2S)-2-hydroxy-2-(1-methylpyrazol-4-yl)ethyl]urea into its molecular formula.
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C17H20N4O2S
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