You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name tert-butyl 3-[2-(4-hydroxyphenyl)ethylcarbamoyl]-1,4,6,7-tetrahydropyrazolo[4,3-c]pyridine-5-carboxylate into its molecular formula.
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C20H26N4O4
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