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 1-[4-(4-nitrobenzoyl)piperazin-1-yl]-3-[(4S)-4-phenyl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl]propan-1-one is given. What is its corresponding molecular formula?
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C27H28N4O4S
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