You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 5,6,7,8-tetrahydronaphthalen-2-yl-[(2S)-2-(1,3,5-trimethylpyrazol-4-yl)pyrrolidin-1-yl]methanone into its molecular formula.
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C21H27N3O
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