You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4,7-diphenyl-2-[8-(9-phenylcarbazol-1-yl)-3,4-dihydrobenzo[a]carbazol-11-yl]thieno[3,2-d]pyrimidine by IUPAC nomenclature, provide its molecular formula.
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C52H34N4S
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