You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 5-[(5-bromofuran-2-carbonyl)amino]-3-(4-ethoxyphenyl)-4-oxothieno[3,4-d]pyridazine-1-carboxylate into molecular formula.
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C22H18BrN3O6S
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