You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[2-[4-(3-chlorophenyl)piperazin-1-yl]ethyl]-4-hydroxypyrrolidine-2-carboxamide;trihydrochloride by IUPAC nomenclature, provide its molecular formula.
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C17H28Cl4N4O2
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