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 ethyl 1-(7-chloroquinolin-4-yl)-5-[[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]methyl]pyrazole-4-carboxylate into its molecular formula.
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C21H23ClN4O3
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