You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-dibenzothiophen-3-yl-N-naphthalen-1-ylspiro[benzo[a]phenalene-7,9'-thioxanthene]-2'-amine is given. What is its corresponding molecular formula?
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C51H31NS2
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