You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(3S)-3-(2-chloro-8-methoxyquinolin-3-yl)-5-(4-chlorophenyl)-3,4-dihydropyrazol-2-yl]ethanone into its molecular formula.
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C21H17Cl2N3O2
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