You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (6Z)-6-[[4-[2-(4-butan-2-ylphenoxy)ethoxy]-3-chloro-5-ethoxyphenyl]methylidene]-5-imino-2-(4-methylphenyl)-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one by IUPAC nomenclature, provide its molecular formula.
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C33H33ClN4O4S
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